Create basic interactive physics system
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parent
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commit
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SSH key fingerprint:
SHA256:cj/YZ5VT+QOKncqSkx+ibKTIn0Obg7OIzwzl9BL8EO8
3 changed files with 190 additions and 129 deletions
91
Cargo.lock
generated
91
Cargo.lock
generated
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@ -85,7 +85,7 @@ checksum = "e89da841a80418a9b391ebaea17f5c112ffaaa96f621d2c285b5174da76b9011"
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dependencies = [
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"cfg-if",
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"const-random",
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"getrandom",
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"getrandom 0.2.15",
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"once_cell",
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"version_check",
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"zerocopy 0.7.35",
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@ -718,7 +718,7 @@ dependencies = [
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"derive_more",
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"glam",
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"itertools",
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"rand",
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"rand 0.8.5",
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"rand_distr",
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"serde",
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"smallvec",
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@ -1051,7 +1051,7 @@ checksum = "63c2174d43a0de99f863c98a472370047a2bfa7d1e5cec8d9d647fb500905d9d"
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dependencies = [
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"ahash",
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"bevy_utils_proc_macros",
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"getrandom",
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"getrandom 0.2.15",
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"hashbrown 0.14.5",
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"thread_local",
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"tracing",
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@ -1409,7 +1409,7 @@ version = "0.1.16"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f9d839f2a20b0aee515dc581a6172f2321f96cab76c1a38a4c584a194955390e"
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dependencies = [
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"getrandom",
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"getrandom 0.2.15",
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"once_cell",
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"tiny-keccak",
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]
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@ -1606,6 +1606,7 @@ dependencies = [
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"avian2d",
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"bevy",
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"log",
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"rand 0.9.0",
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]
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[[package]]
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@ -1882,10 +1883,22 @@ dependencies = [
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"cfg-if",
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"js-sys",
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"libc",
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"wasi",
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"wasi 0.11.0+wasi-snapshot-preview1",
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"wasm-bindgen",
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]
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[[package]]
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name = "getrandom"
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version = "0.3.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "73fea8450eea4bac3940448fb7ae50d91f034f941199fcd9d909a5a07aa455f0"
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dependencies = [
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"cfg-if",
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"libc",
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"r-efi",
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"wasi 0.14.2+wasi-0.2.4",
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]
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[[package]]
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name = "gl_generator"
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version = "0.14.0"
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@ -1904,7 +1917,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "dc46dd3ec48fdd8e693a98d2b8bafae273a2d54c1de02a2a7e3d57d501f39677"
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dependencies = [
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"bytemuck",
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"rand",
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"rand 0.8.5",
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"serde",
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]
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@ -3036,6 +3049,12 @@ dependencies = [
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"proc-macro2",
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]
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[[package]]
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name = "r-efi"
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version = "5.2.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "74765f6d916ee2faa39bc8e68e4f3ed8949b48cccdac59983d287a7cb71ce9c5"
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[[package]]
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name = "radsort"
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version = "0.1.1"
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@ -3049,8 +3068,19 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
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dependencies = [
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"libc",
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"rand_chacha",
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"rand_core",
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"rand_chacha 0.3.1",
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"rand_core 0.6.4",
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]
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[[package]]
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name = "rand"
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version = "0.9.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "3779b94aeb87e8bd4e834cee3650289ee9e0d5677f976ecdb6d219e5f4f6cd94"
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dependencies = [
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"rand_chacha 0.9.0",
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"rand_core 0.9.3",
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"zerocopy 0.8.24",
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]
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[[package]]
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@ -3060,7 +3090,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
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dependencies = [
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"ppv-lite86",
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"rand_core",
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"rand_core 0.6.4",
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]
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[[package]]
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name = "rand_chacha"
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version = "0.9.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "d3022b5f1df60f26e1ffddd6c66e8aa15de382ae63b3a0c1bfc0e4d3e3f325cb"
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dependencies = [
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"ppv-lite86",
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"rand_core 0.9.3",
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]
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[[package]]
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@ -3069,7 +3109,16 @@ version = "0.6.4"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
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dependencies = [
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"getrandom",
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"getrandom 0.2.15",
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]
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[[package]]
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name = "rand_core"
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version = "0.9.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "99d9a13982dcf210057a8a78572b2217b667c3beacbf3a0d8b454f6f82837d38"
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dependencies = [
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"getrandom 0.3.2",
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]
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[[package]]
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@ -3079,7 +3128,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "32cb0b9bc82b0a0876c2dd994a7e7a2683d3e7390ca40e6886785ef0c7e3ee31"
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dependencies = [
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"num-traits",
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"rand",
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"rand 0.8.5",
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]
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[[package]]
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@ -3833,7 +3882,7 @@ version = "1.12.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "b3758f5e68192bb96cc8f9b7e2c2cfdabb435499a28499a42f8f984092adad4b"
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dependencies = [
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"getrandom",
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"getrandom 0.2.15",
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"serde",
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]
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@ -3865,6 +3914,15 @@ version = "0.11.0+wasi-snapshot-preview1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
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[[package]]
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name = "wasi"
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version = "0.14.2+wasi-0.2.4"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "9683f9a5a998d873c0d21fcbe3c083009670149a8fab228644b8bd36b2c48cb3"
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dependencies = [
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"wit-bindgen-rt",
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]
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[[package]]
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name = "wasm-bindgen"
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version = "0.2.100"
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@ -4480,6 +4538,15 @@ dependencies = [
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"memchr",
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]
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[[package]]
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name = "wit-bindgen-rt"
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version = "0.39.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "6f42320e61fe2cfd34354ecb597f86f413484a798ba44a8ca1165c58d42da6c1"
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dependencies = [
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"bitflags 2.9.0",
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]
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[[package]]
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name = "xcursor"
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version = "0.3.8"
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@ -33,3 +33,4 @@ log = { version = "*", features = [
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"max_level_debug",
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"release_max_level_warn",
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] }
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rand = "0.9.0"
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219
src/main.rs
219
src/main.rs
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@ -1,152 +1,145 @@
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//! This example showcases how `Transform` interpolation or extrapolation can be used
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//! to make movement appear smooth at fixed timesteps.
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//!
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//! To produce consistent, frame rate independent behavior, physics by default runs
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//! in the `FixedPostUpdate` schedule with a fixed timestep, meaning that the time between
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//! physics ticks remains constant. On some frames, physics can either not run at all or run
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//! more than once to catch up to real time. This can lead to visible stutter for movement.
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//!
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//! `Transform` interpolation resolves this issue by updating `Transform` at every frame in between
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//! physics ticks to smooth out the visual result. The interpolation is done from the previous position
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//! to the current physics position, which keeps movement smooth, but has the downside of making movement
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//! feel slightly delayed as the rendered result lags slightly behind the true positions.
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//!
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//! `Transform` extrapolation works similarly, but instead of using the previous positions, it predicts
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//! the next positions based on velocity. This makes movement feel much more responsive, but can cause
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//! jumpy results when the prediction is wrong, such as when the velocity of an object is suddenly altered.
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use std::f32::consts::PI;
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use avian2d::{math::*, prelude::*};
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use avian2d::{math::Vector, prelude::*};
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use bevy::{
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color::palettes::{
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css::WHITE,
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tailwind::{CYAN_400, LIME_400, RED_400},
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tailwind::{LIME_400, RED_400},
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},
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input::common_conditions::input_pressed,
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prelude::*,
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};
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use rand::Rng;
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const AREA_WIDTH: f32 = 750.;
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const PLAYER_SIZE: f32 = 30.;
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fn main() {
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let mut app = App::new();
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// Interpolation and extrapolation functionality is enabled by the `PhysicsInterpolationPlugin`.
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// It is included in the `PhysicsPlugins` by default.
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app.add_plugins((
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App::new()
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.add_plugins((
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DefaultPlugins,
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PhysicsPlugins::default().with_length_unit(50.0),
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));
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// By default, interpolation must be enabled for each entity manually
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// by adding the `TransformInterpolation` component.
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//
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// It can also be enabled for all rigid bodies with `PhysicsInterpolationPlugin::interpolate_all()`:
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//
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// app.add_plugins(PhysicsPlugins::default().set(PhysicsInterpolationPlugin::interpolate_all()));
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// Set gravity.
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app.insert_resource(Gravity(Vector::NEG_Y * 900.0));
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// Set the fixed timestep to just 10 Hz for demonstration purposes.
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app.insert_resource(Time::from_hz(10.0));
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// Setup the scene and UI, and update text in `Update`.
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app.add_systems(Startup, (setup_scene, setup_balls))
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PhysicsPlugins::default()
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.with_length_unit(50.0)
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.set(PhysicsInterpolationPlugin::interpolate_all()),
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))
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.add_systems(
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Startup,
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(setup_scene, setup_player, setup_balls, setup_walls),
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)
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.add_systems(
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Update,
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(
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change_timestep,
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// Reset the scene when the 'R' key is pressed.
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reset_balls.run_if(input_pressed(KeyCode::KeyR)),
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),
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);
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// Run the app.
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app.run();
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(move_player, quit.run_if(input_pressed(KeyCode::KeyQ))),
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)
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.insert_resource(Gravity(Vector::ZERO))
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.run();
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}
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#[derive(Component)]
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struct Ball;
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fn setup_scene(
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mut commands: Commands,
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mut materials: ResMut<Assets<ColorMaterial>>,
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mut meshes: ResMut<Assets<Mesh>>,
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) {
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// Spawn a camera.
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fn setup_scene(mut commands: Commands) {
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commands.spawn(Camera2d);
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// Spawn the ground.
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commands.spawn((
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Name::new("Ground"),
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RigidBody::Static,
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Collider::rectangle(500.0, 20.0),
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Restitution::new(0.99).with_combine_rule(CoefficientCombine::Max),
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Transform::from_xyz(0.0, -300.0, 0.0),
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Mesh2d(meshes.add(Rectangle::new(500.0, 20.0))),
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MeshMaterial2d(materials.add(Color::from(WHITE))),
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));
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}
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#[derive(Component, Default)]
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#[require(Collider, Mesh2d, MeshMaterial2d<ColorMaterial>, Restitution(|| Restitution::new(1.0)), RigidBody, TransformInterpolation, Transform)]
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struct GameObject;
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#[derive(Component, Default)]
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#[require(GameObject, RigidBody(|| RigidBody::Dynamic))]
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struct Ball;
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fn setup_balls(
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mut commands: Commands,
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mut materials: ResMut<Assets<ColorMaterial>>,
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mut meshes: ResMut<Assets<Mesh>>,
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) {
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let circle = Circle::new(30.0);
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let mesh = meshes.add(circle);
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// This entity uses transform interpolation.
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let mut rng = rand::rng();
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for _ in 0..20 {
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let circle = Circle::new(rng.random_range(10.0..(PLAYER_SIZE - 5.)));
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let mut transform = Transform::from_xyz(
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0.,
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rng.random_range((PLAYER_SIZE + 5.)..(AREA_WIDTH / 2. - PLAYER_SIZE)),
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0.,
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);
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transform.rotate_around(
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Vec3::ZERO,
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Quat::from_rotation_z(rng.random_range(0.0..(PI * 2.))),
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);
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commands.spawn((
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Name::new("Interpolation"),
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Ball,
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RigidBody::Dynamic,
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Collider::from(circle),
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TransformInterpolation,
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Transform::from_xyz(-100.0, 300.0, 0.0),
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Mesh2d(mesh.clone()),
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MeshMaterial2d(materials.add(Color::from(CYAN_400)).clone()),
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Mesh2d(meshes.add(circle)),
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MeshMaterial2d(materials.add(Color::from(RED_400))),
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transform,
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));
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}
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}
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// This entity uses transform extrapolation.
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commands.spawn((
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Name::new("Extrapolation"),
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Ball,
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RigidBody::Dynamic,
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Collider::from(circle),
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TransformExtrapolation,
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Transform::from_xyz(0.0, 300.0, 0.0),
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Mesh2d(mesh.clone()),
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MeshMaterial2d(materials.add(Color::from(LIME_400)).clone()),
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));
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#[derive(Component, Default)]
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#[require(Ball, RigidBody(|| RigidBody::Dynamic))]
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struct Player;
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// This entity is simulated in `FixedUpdate` without any smoothing.
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fn setup_player(
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mut commands: Commands,
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mut materials: ResMut<Assets<ColorMaterial>>,
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mut meshes: ResMut<Assets<Mesh>>,
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) {
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let circle = Circle::new(PLAYER_SIZE);
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commands.spawn((
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Name::new("No Interpolation"),
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Ball,
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RigidBody::Dynamic,
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Player,
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Collider::from(circle),
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Transform::from_xyz(100.0, 300.0, 0.0),
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Mesh2d(mesh.clone()),
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MeshMaterial2d(materials.add(Color::from(RED_400)).clone()),
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Mesh2d(meshes.add(circle)),
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MeshMaterial2d(materials.add(Color::from(LIME_400))),
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));
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}
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/// Despawns all balls and respawns them.
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fn reset_balls(mut commands: Commands, query: Query<Entity, With<Ball>>) {
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for entity in &query {
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commands.entity(entity).despawn();
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#[derive(Component, Default)]
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#[require(GameObject, RigidBody(|| RigidBody::Static))]
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struct Wall;
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fn setup_walls(
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mut commands: Commands,
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mut materials: ResMut<Assets<ColorMaterial>>,
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mut meshes: ResMut<Assets<Mesh>>,
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) {
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let thickness = 20.;
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let width = AREA_WIDTH + thickness;
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for i in 0..4 {
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let mut transform = Transform::from_xyz(0., AREA_WIDTH / 2., 0.);
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transform.rotate_around(Vec3::ZERO, Quat::from_rotation_z((i as f32) * PI / 2.));
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commands.spawn((
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Wall,
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Collider::rectangle(width, thickness),
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Mesh2d(meshes.add(Rectangle::new(width, thickness))),
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MeshMaterial2d(materials.add(Color::from(WHITE))),
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transform,
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));
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}
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}
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commands.run_system_cached(setup_balls);
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fn move_player(
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time: Res<Time>,
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keyboard_input: Res<ButtonInput<KeyCode>>,
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mut player: Query<&mut LinearVelocity, With<Player>>,
|
||||
) {
|
||||
let acceleration = 500.;
|
||||
|
||||
let mut velocity = player.single_mut();
|
||||
let delta_time = time.delta_secs();
|
||||
|
||||
if keyboard_input.any_pressed([KeyCode::KeyW, KeyCode::ArrowUp]) {
|
||||
velocity.y += acceleration * delta_time;
|
||||
}
|
||||
if keyboard_input.any_pressed([KeyCode::KeyS, KeyCode::ArrowDown]) {
|
||||
velocity.y -= acceleration * delta_time;
|
||||
}
|
||||
if keyboard_input.any_pressed([KeyCode::KeyA, KeyCode::ArrowLeft]) {
|
||||
velocity.x -= acceleration * delta_time;
|
||||
}
|
||||
if keyboard_input.any_pressed([KeyCode::KeyD, KeyCode::ArrowRight]) {
|
||||
velocity.x += acceleration * delta_time;
|
||||
}
|
||||
}
|
||||
|
||||
/// Changes the timestep of the simulation when the up or down arrow keys are pressed.
|
||||
fn change_timestep(mut time: ResMut<Time<Fixed>>, keyboard_input: Res<ButtonInput<KeyCode>>) {
|
||||
if keyboard_input.pressed(KeyCode::ArrowUp) {
|
||||
let new_timestep = (time.delta_secs_f64() * 0.975).max(1.0 / 255.0);
|
||||
time.set_timestep_seconds(new_timestep);
|
||||
}
|
||||
if keyboard_input.pressed(KeyCode::ArrowDown) {
|
||||
let new_timestep = (time.delta_secs_f64() * 1.025).min(1.0 / 5.0);
|
||||
time.set_timestep_seconds(new_timestep);
|
||||
}
|
||||
fn quit(mut exit: EventWriter<AppExit>) {
|
||||
exit.send(AppExit::Success);
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue