diff --git a/Cargo.lock b/Cargo.lock
index a790240..3ddac41 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -208,9 +208,9 @@ checksum = "904dfeac50f3cdaba28fc6f57fdcddb75f49ed61346676a78c4ffe55877802fd"
 
 [[package]]
 name = "bevy"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "55f08528a4e59d607460513a823b40f602d013c1a00f57b824f1075d5d48c3cd"
+checksum = "fea147ef1ebb92d41294cfad804c40de151b174c711ce6e0a4a40eba23eae1a4"
 dependencies = [
  "bevy_internal",
 ]
@@ -241,9 +241,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_animation"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e243169af495ad616ff701247c0d3e40078a26ed8de231cf9e54bde6b3c4bb45"
+checksum = "a4365465fca7bd78295eb81d0a04afc049399852793d562eb017849bb5d6c55e"
 dependencies = [
  "bevy_app",
  "bevy_asset",
@@ -259,9 +259,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_app"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "53d26d6ffdf493609d2fedc1018a2ef0cb4d8e48f6d3bcea56fa2df81867e464"
+checksum = "9e4ae0a6ed2adf3b153511b4645241660a93f747c05ecd1e5a909dafc803cad4"
 dependencies = [
  "bevy_derive",
  "bevy_ecs",
@@ -274,9 +274,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_asset"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3d8fb95306d5f18fa70df40632cd984993aeb71e91ce059ae99699098a4f9ce9"
+checksum = "2ec773c861a7e9d9978771f59f385500ec6da3a1ab5487705cddb054393d3d19"
 dependencies = [
  "anyhow",
  "bevy_app",
@@ -302,9 +302,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_audio"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eee08ac575397ce17477dd291862bafa15226334bdfb82c02bbc3d10bad7bdb8"
+checksum = "1e5cf4713a24f318841f73a9e030854cfd5bad46bc81fa1acc9590cdab053c6f"
 dependencies = [
  "anyhow",
  "bevy_app",
@@ -318,9 +318,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_core"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c6712146d54fff9e1865362e9f39a7b63c7b037ddb72a3d7bb05b959213fb61e"
+checksum = "c53172003d5cde7780870b5403c66c8ede3581faf3e510e916d8b4baa5b538d2"
 dependencies = [
  "bevy_app",
  "bevy_ecs",
@@ -333,9 +333,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_core_pipeline"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "080bb00399b6d7697e505f871d67c6de8b52eb06b47b0cda2be80c2396805983"
+checksum = "5e60efd10d593f6d122f2687f74c09ad55835a8f999c35bed6380ddd8e6ff7f2"
 dependencies = [
  "bevy_app",
  "bevy_asset",
@@ -351,9 +351,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_derive"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a4b8f0786d1fc7e0d35297917be463db3d0886f7bd8d4221ca3d565502579ffb"
+checksum = "0e6345431bbe6d7b6c165cd860ecd0b35da929779571259c5df970ac256d45f9"
 dependencies = [
  "bevy_macro_utils",
  "quote",
@@ -362,9 +362,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_diagnostic"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adab74ee5375fbf5d2b1d3da41de8d1491a8a706d17441b5e31214b65349d692"
+checksum = "58ac9f4c2815f412be4b6e21e4b299cdafa710f651d064f6d40b2a8377a0d17c"
 dependencies = [
  "bevy_app",
  "bevy_ecs",
@@ -375,9 +375,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_ecs"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a5643dc27b7d6778e3a66c8e0f6ad1fd33309aa2fa61d935f360ccc85b7be6a2"
+checksum = "c174066a24ed8a14d15ea58b0aea1c1f5c763f4bb36ebdc2b1dc78026007d0f5"
 dependencies = [
  "async-channel",
  "bevy_ecs_macros",
@@ -394,9 +394,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_ecs_macros"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a5f2f12677f8725d40930d0a19652f007fe0ef5ac38e23817cfc4930c61f5680"
+checksum = "cc50c39e49e8febccc74e8e731680adb0cb4aef1f53275740cbaa95c6da71f4f"
 dependencies = [
  "bevy_macro_utils",
  "proc-macro2",
@@ -419,9 +419,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_encase_derive"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "76a767adc36ce1fc917a736843b026d4de7069d90ed5e669c852481ef69fd5aa"
+checksum = "68bc194009c5e9b97da64a08142dd183c264885d99c985cf849868103018adf1"
 dependencies = [
  "bevy_macro_utils",
  "encase_derive_impl",
@@ -429,9 +429,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_gilrs"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "963940426127533164af2a556971a03c493143c0afb95afadb4a070b6ab8c3df"
+checksum = "cb15a3427d9707be92b457e5d66900b02d853b475c21dd8662bdda387ba9f24e"
 dependencies = [
  "bevy_app",
  "bevy_ecs",
@@ -442,9 +442,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_gltf"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "150cc6782c4472600c2ade5d78c6ce481c992690f0499e63765aba752d7e0f04"
+checksum = "79db7d7e71b47a69953fbe8407ded5c6308eaeecf9a05efd5dfb42992f400a16"
 dependencies = [
  "anyhow",
  "base64",
@@ -471,9 +471,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_hierarchy"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8e2e4c20d7c843cd26ef3c5d7b4c20e3e32c275943e2437ecaca1cfd6cfe3b30"
+checksum = "5eb1ec76099ea5a716de08ea42ff41f036ebe2502df1d569168b58f16458a85e"
 dependencies = [
  "bevy_app",
  "bevy_ecs",
@@ -484,9 +484,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_input"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a11c70573fb4d4c056ba32cfa553daa7e6e1245cb876ccfbe322640928b7ee1c"
+checksum = "1821c4b760ba6ddb4fe61806e9cc33f40b09a884557aca4553a29b8c7d73c6b4"
 dependencies = [
  "bevy_app",
  "bevy_ecs",
@@ -496,9 +496,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_internal"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0d603b597772130782eab6e604706cbb764fb037f9cf0a1904b6f342845b6f44"
+checksum = "ee63ad1e3f95a26ff2c227fadb1534a7bfe3a098e0e45c347f2f2575a573d9bc"
 dependencies = [
  "bevy_animation",
  "bevy_app",
@@ -534,9 +534,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_log"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8cafb12fc84734236e36f407ab62c72d5d4279fa4777e40a95d7cc973cbabcd1"
+checksum = "092daf498887814a064331dfcd1cf487a5ddab01fd38629b84a35b8b664462a1"
 dependencies = [
  "android_log-sys",
  "bevy_app",
@@ -549,9 +549,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_macro_utils"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d081af83b701e16cad209255ba6b383744dfa49efa99eb6505989f293305ab3"
+checksum = "43fb5137e5198302d7c6c33d1e454cf48a586e7c6fd12f4860f12863951e16b9"
 dependencies = [
  "quote",
  "syn",
@@ -560,18 +560,18 @@ dependencies = [
 
 [[package]]
 name = "bevy_math"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "db5394e86c5708d3aa506c6e98ec4ed2a4083a7a018c6693d9ac0e77ebfabfc2"
+checksum = "531f2b90c7e861a96f418b3d560131b3354c5e67a67eba3953a45a56ea0114d2"
 dependencies = [
  "glam",
 ]
 
 [[package]]
 name = "bevy_mikktspace"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "40b299a61175a6f7e7398f83cd5b50920fd8bad4df674e614ad94f25f8426509"
+checksum = "941e7d3d4e1dbb735f040e4cdc1558be1d3c38d43f1d9fdbb039c39a7849a00b"
 dependencies = [
  "glam",
 ]
@@ -599,9 +599,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_ptr"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d92d5679e89602a18682a37846573dcd1979410179e14204280460ba9fb8713a"
+checksum = "9960c19e582b43cebe1894b6679520a4f50802d1cc5b6fa432f8d685ed232f09"
 
 [[package]]
 name = "bevy_rapier2d"
@@ -618,9 +618,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_reflect"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08798e67f2d4e6898ef117d8c99cf3b50a8eebc8da4159e6dad2657a0fbe9a4e"
+checksum = "3fc689dd7a7df3b3768884a4754711d406aa302ea48da483c03b52715fa95045"
 dependencies = [
  "bevy_ptr",
  "bevy_reflect_derive",
@@ -637,9 +637,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_reflect_derive"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "19209a7f0238053802b7de04e6724bd90d4ed7d90e87101dbd1b64cca64ff694"
+checksum = "8c36fa5100832c787c10558d31632ddc454c221e8dfacbbef836938f59614754"
 dependencies = [
  "bevy_macro_utils",
  "proc-macro2",
@@ -650,9 +650,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_render"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bb49530388ef17cff3fb8bd5e47372fb3cfeb4befc73e3036f6462ac20f049ef"
+checksum = "600bcef85c7efac6e38ed725707f0e5b7c59b510430034ba2f743f472493f845"
 dependencies = [
  "anyhow",
  "bevy_app",
@@ -693,9 +693,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_render_macros"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e7d0b7a51fa819c20c64f43856c5aaea40f853050bbb09b9ba3672e5ff2688a5"
+checksum = "1be90adc9e5d5808833e363670818da5fe68ccafd7ca983a457f90957d2a430b"
 dependencies = [
  "bevy_macro_utils",
  "proc-macro2",
@@ -705,9 +705,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_scene"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0064d73ebb0de39901478b493604a1a6d448fd337b66803004c60f41f1fa6c37"
+checksum = "a045d575d2c8f776d8ea965363c81660243fefbfc3712ead938b00dfd6797216"
 dependencies = [
  "anyhow",
  "bevy_app",
@@ -753,9 +753,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_tasks"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ff874c91a36eaac3ef957c6f3b590fb71332d9d136671cc858847d56fe9f80a3"
+checksum = "719b753acb3d5b9dbfd77038560fe1893c17d4ee0a4242c2ee70da9d59430537"
 dependencies = [
  "async-channel",
  "async-executor",
@@ -768,9 +768,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_text"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef05a788c2c04aaa5db95b22a8f0fff0d3a0b08a7bcd1a71f050a628b38eec6e"
+checksum = "c265b7515faf55a3b92fd6ce0ab65dd246f247e11d737d6f5cdaf49c2be42c63"
 dependencies = [
  "ab_glyph",
  "anyhow",
@@ -791,9 +791,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_time"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74ec681d641371df81d7bfbcb0eea725ed873f38a094f34b5f7b436f0889e77c"
+checksum = "22830665b8476292b861216383fd79922aef2b540f9fd09d49144e3e5e94550e"
 dependencies = [
  "bevy_app",
  "bevy_ecs",
@@ -804,9 +804,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_transform"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "42e1528e35f30bede46a50ee4134f150efc01f5c1002c340b3b2e6a0bfcb8aa5"
+checksum = "a4bb8760f03e9667e7499a5ceec1f7630fc3e45702781ac0df56cb969e8ae668"
 dependencies = [
  "bevy_app",
  "bevy_ecs",
@@ -845,9 +845,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_utils"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8bda6dada53e546845887ae7357eec57b8d547ef71627b716b33839b4a98b687"
+checksum = "f6e9aa1866c1cf7ee000f281ce9e90d02d701f5c7380a107252017e58e2f5246"
 dependencies = [
  "ahash",
  "getrandom",
@@ -874,9 +874,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_winit"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "57537a56ac4f4e1ffcad95227bcab37cd17b51770dacff82374a2d88be376322"
+checksum = "98b15fee4b75472e3441b0c7221467303e4ce59b342a94a328e447e7cdb5a43c"
 dependencies = [
  "approx",
  "bevy_app",
@@ -904,6 +904,7 @@ dependencies = [
  "hexodsp",
  "rand",
  "rand_distr",
+ "rapier2d",
  "ticktock",
 ]
 
diff --git a/Cargo.toml b/Cargo.toml
index f79d249..f50dc6f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,12 +6,13 @@ license = "AGPL-3.0-only"
 edition = "2021"
 
 [dependencies]
-bevy = "0.8.0"
+bevy = "0.8.1"
 bevy-inspector-egui = "0.12.1"
 bevy_rapier2d = "0.16.2"
 crossbeam-channel = "0.5.6"
 rand = "0.8.5"
 rand_distr = "0.4.3"
+rapier2d = "0.14.0"
 
 [target."cfg(not(target_arch = \"wasm32\"))".dependencies]
 cpal = "0.14.0"
diff --git a/README.md b/README.md
index bb59e47..db5e8dc 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,9 @@
 ## TODO
 
 * name
-* color filters
+* more filters
+* despawn black characters
+* despawn character when too far
 * level design
 * (?) can jump only from a surface (no mid-air jump)
 * (?) multiplayer
diff --git a/src/game.rs b/src/game.rs
index a265f88..f908016 100644
--- a/src/game.rs
+++ b/src/game.rs
@@ -12,6 +12,7 @@ use bevy::{
 	sprite::Mesh2dHandle,
 };
 use bevy_rapier2d::prelude::*;
+use rapier2d::geometry::CollisionEventFlags;
 
 pub enum AudioMsg {
 	Color([f32; 3]),
@@ -154,7 +155,6 @@ pub fn spawn_character(
 		.insert(CharacterColor(color))
 		.insert(RigidBody::Dynamic)
 		.insert(Collider::cuboid(32., 32.))
-		.insert(ExternalForce::default())
 		.insert(Velocity::default())
 		.insert(GravityScale(10.0))
 		.insert(LockedAxes::ROTATION_LOCKED)
@@ -163,7 +163,6 @@ pub fn spawn_character(
 			linear_damping: 0.5,
 			angular_damping: 0.5,
 		})
-		.insert(ExternalImpulse::default())
 		.insert(ActiveEvents::COLLISION_EVENTS);
 
 	if is_player {
@@ -179,7 +178,13 @@ fn collision_event_system(
 	character_meshes: Res<CharacterMeshes>,
 	mut materials: ResMut<Assets<ColorMaterial>>,
 	mut collision_events: EventReader<CollisionEvent>,
-	character_query: Query<(&CharacterColor, &Transform, Option<&Player>)>,
+	mut character_query: Query<(
+		&mut CharacterColor,
+		&Transform,
+		&mut Handle<ColorMaterial>,
+		Option<&Player>,
+	)>,
+	pass_through_filter_query: Query<(&PassThroughFilter, &FilterColor)>,
 	mut app_state: ResMut<State<AppState>>,
 	audio: Res<crossbeam_channel::Sender<AudioMsg>>,
 ) {
@@ -187,8 +192,8 @@ fn collision_event_system(
 		if let CollisionEvent::Started(e1, e2, flags) = collision_event {
 			if flags.is_empty() {
 				if let (
-					Ok((c1_color, c1_transform, c1_player)),
-					Ok((c2_color, c2_transform, c2_player)),
+					Ok((c1_color, c1_transform, _c1_material, c1_player)),
+					Ok((c2_color, c2_transform, _c2_material, c2_player)),
 				) = (character_query.get(*e1), character_query.get(*e2))
 				{
 					commands.entity(*e1).despawn_recursive();
@@ -225,6 +230,34 @@ fn collision_event_system(
 
 					audio.send(AudioMsg::Fusion).ok();
 				}
+			} else if *flags == CollisionEventFlags::SENSOR {
+				if let (
+					Ok((mut c_color, _c_transform, mut c_material, c_player)),
+					Ok((filter, filter_color)),
+				) = (
+					character_query.get_mut(*e1),
+					pass_through_filter_query.get(*e2),
+				) {
+					c_color.0 = match filter {
+						PassThroughFilter::Absorbing => Vec4::from(c_color.0)
+							.mul_add(
+								-Vec4::from(filter_color.0) * Vec4::from([1., 1., 1., 0.]),
+								Vec4::from(c_color.0),
+							)
+							.into(),
+					};
+					*c_material = materials.add(ColorMaterial::from(c_color.0));
+
+					if c_player.is_some() {
+						audio
+							.send(AudioMsg::Color([
+								c_color.0.r(),
+								c_color.0.g(),
+								c_color.0.b(),
+							]))
+							.ok();
+					}
+				}
 			}
 		}
 	}
@@ -300,10 +333,10 @@ fn player_movement_system(
 }
 
 fn character_particle_effect_system(
-	characters: Query<(&Transform, &CharacterColor), With<Player>>,
+	player_character: Query<(&Transform, &CharacterColor), With<Player>>,
 	mut particle_effect: ResMut<crate::particle_effect::ParticleEffectResource>,
 ) {
-	for (transform, color) in characters.iter() {
+	if let Ok((transform, color)) = player_character.get_single() {
 		particle_effect.translation = transform.translation;
 		particle_effect.color = color.0;
 	}