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@@ -0,0 +1,128 @@
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+import {
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+ UniformsLib,
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+ UniformsUtils,
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+ Matrix4
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+} from 'three';
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+
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+/**
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+ * Mesh Velocity Shader @bhouston
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+ */
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+
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+const VelocityShader = {
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+
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+ uniforms: UniformsUtils.merge( [
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+ UniformsLib.common,
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+ UniformsLib.displacementmap,
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+ {
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+ modelMatrixPrev: { value: new Matrix4() },
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+ currentProjectionViewMatrix: { value: new Matrix4() },
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+ previousProjectionViewMatrix: { value: new Matrix4() }
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+ }
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+ ] ),
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+
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+ vertexShader: /* glsl */`
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+#define NORMAL
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+
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+#if defined( FLAT_SHADED ) || defined( USE_BUMPMAP ) || defined( TANGENTSPACE_NORMALMAP )
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+
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+ varying vec3 vViewPosition;
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+
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+#endif
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+
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+#include <common>
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+#include <packing>
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+#include <uv_pars_vertex>
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+#include <displacementmap_pars_vertex>
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+#include <normal_pars_vertex>
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+#include <morphtarget_pars_vertex>
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+#include <skinning_pars_vertex>
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+#include <logdepthbuf_pars_vertex>
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+#include <clipping_planes_pars_vertex>
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+
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+uniform mat4 previousProjectionViewMatrix;
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+uniform mat4 currentProjectionViewMatrix;
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+
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+uniform mat4 modelMatrixPrev;
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+
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+varying vec4 clipPositionCurrent;
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+varying vec4 clipPositionPrevious;
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+
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+void main() {
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+
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+
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+ #include <uv_vertex>
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+
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+ #include <beginnormal_vertex>
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+ #include <morphnormal_vertex>
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+ #include <skinbase_vertex>
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+ #include <skinnormal_vertex>
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+ #include <defaultnormal_vertex>
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+ #include <normal_vertex>
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+
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+ #include <begin_vertex>
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+ #include <morphtarget_vertex>
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+ #include <displacementmap_vertex>
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+ #include <morphtarget_vertex>
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+ #include <skinning_vertex>
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+
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+#ifdef USE_SKINNING
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+
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+ vec4 mvPosition = modelViewMatrix * skinned;
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+ clipPositionCurrent = currentProjectionViewMatrix * modelMatrix * skinned;
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+ clipPositionPrevious = previousProjectionViewMatrix * modelMatrixPrev * skinned;
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+
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+#else
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+
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+ vec4 mvPosition = modelViewMatrix * vec4( transformed, 1.0 );
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+ clipPositionCurrent = currentProjectionViewMatrix * modelMatrix * vec4( transformed, 1.0 );
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+ clipPositionPrevious = previousProjectionViewMatrix * modelMatrixPrev * vec4( transformed, 1.0 );
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+
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+#endif
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+
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+ gl_Position = projectionMatrix * mvPosition;
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+
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+ #include <logdepthbuf_vertex>
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+ #include <clipping_planes_vertex>
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+}
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+`,
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+ fragmentShader: /* glsl */`
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+#define NORMAL
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+
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+uniform float opacity;
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+
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+#include <packing>
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+#include <uv_pars_fragment>
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+#include <map_pars_fragment>
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+#include <alphamap_pars_fragment>
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+#include <alphatest_pars_fragment>
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+#include <logdepthbuf_pars_fragment>
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+#include <clipping_planes_pars_fragment>
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+
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+varying vec4 clipPositionCurrent;
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+varying vec4 clipPositionPrevious;
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+
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+void main() {
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+
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+ vec4 diffuseColor = vec4( 1.0 );
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+ diffuseColor.a = opacity;
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+
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+ #include <map_fragment>
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+ #include <alphamap_fragment>
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+ #include <alphatest_fragment>
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+
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+ vec2 ndcPositionCurrent = clipPositionCurrent.xy/clipPositionCurrent.w;
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+ vec2 ndcPositionPrevious = clipPositionPrevious.xy/clipPositionPrevious.w;
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+ vec2 vel = ( ndcPositionCurrent - ndcPositionPrevious ) * 0.5;
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+ vel = vel * 0.5 + 0.5;
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+ vec2 v1 = packDepthToRG(vel.x);
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+ vec2 v2 = packDepthToRG(vel.y);
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+ gl_FragColor = vec4(v1.x, v1.y, v2.x, v2.y);
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+
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+ #include <logdepthbuf_fragment>
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+
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+}
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+
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+`
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+};
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+
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+export { VelocityShader };
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Ben Houston