@bitowl/three-instanced-mesh
Version:
Scene graph level abstraction for three.js InstancedBufferGeometry
57 lines (37 loc) • 1.38 kB
JavaScript
/**************************
* Dusan Bosnjak @pailhead
**************************/
module.exports = [
"#if defined( USE_MAP ) || defined( USE_BUMPMAP ) || defined( USE_NORMALMAP ) || defined( USE_SPECULARMAP ) || defined( USE_ALPHAMAP ) || defined( USE_EMISSIVEMAP ) || defined( USE_ROUGHNESSMAP ) || defined( USE_METALNESSMAP )",
"varying vec2 vUv;",
"uniform mat3 uvTransform;",
"#endif",
"#ifdef INSTANCE_TRANSFORM",
//for dynamic, avoid computing the matrices on the cpu
"attribute vec3 instancePosition;",
"attribute vec4 instanceQuaternion;",
"attribute vec3 instanceScale;",
"#if defined( INSTANCE_COLOR )",
"attribute vec3 instanceColor;",
"varying vec3 vInstanceColor;",
"#endif",
"mat4 getInstanceMatrix(){",
"vec4 q = instanceQuaternion;",
"vec3 s = instanceScale;",
"vec3 v = instancePosition;",
"vec3 q2 = q.xyz + q.xyz;",
"vec3 a = q.xxx * q2.xyz;",
"vec3 b = q.yyz * q2.yzz;",
"vec3 c = q.www * q2.xyz;",
"vec3 r0 = vec3( 1.0 - (b.x + b.z) , a.y + c.z , a.z - c.y ) * s.xxx;",
"vec3 r1 = vec3( a.y - c.z , 1.0 - (a.x + b.z) , b.y + c.x ) * s.yyy;",
"vec3 r2 = vec3( a.z + c.y , b.y - c.x , 1.0 - (a.x + b.x) ) * s.zzz;",
"return mat4(",
"r0 , 0.0,",
"r1 , 0.0,",
"r2 , 0.0,",
"v , 1.0",
");",
"}",
"#endif"
].join("\n");