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Merge pull request #275 from xyz-tools/poc/instant-color-change
Update color instantly
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| import { ShaderMaterial } from 'three/src/materials/ShaderMaterial.js'; | ||
| import { Color } from 'three/src/math/Color.js'; | ||
|
|
||
| /* | ||
| This file contains a custom ShaderMaterial that calculates the lighting of a mesh based on the normal of the mesh and a fixed light direction. | ||
| The material also allows for setting the color, ambient light intensity, directional light intensity, and brightness. | ||
| */ | ||
|
|
||
| // Vertex Shader | ||
| const vertexShader = ` | ||
| uniform float clipMinY; | ||
| uniform float clipMaxY; | ||
| varying vec3 vNormal; | ||
| varying vec3 vPosition; | ||
| varying float vWorldY; | ||
| void main() { | ||
| vNormal = normalize(normalMatrix * normal); | ||
| vPosition = position; | ||
| vWorldY = (modelMatrix * vec4(position, 1.0)).y; | ||
| gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0); | ||
| } | ||
| `; | ||
|
|
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| // Fragment Shader | ||
| const fragmentShader = ` | ||
| uniform vec3 uColor; | ||
| uniform float ambient; | ||
| uniform float directional; | ||
| uniform float brightness; | ||
| uniform float clipMinY; | ||
| uniform float clipMaxY; | ||
| varying vec3 vNormal; | ||
| varying vec3 vPosition; | ||
| varying float vWorldY; | ||
| void main() { | ||
| // Apply clipping | ||
| if (vWorldY < clipMinY || vWorldY > clipMaxY) { | ||
| discard; | ||
| } | ||
| // Fixed light direction (pointing from front-left) | ||
| vec3 lightDir = normalize(vec3(-0.8, -0.2, -0.8)); | ||
| // Calculate diffuse lighting with increased intensity | ||
| float diff = max(dot(vNormal, -lightDir), 0.0) * directional; | ||
| // Combine lighting with color | ||
| vec3 finalColor = uColor * (diff + ambient); | ||
| // Add a bit of extra brightness | ||
| finalColor = min(finalColor * brightness, 1.0); | ||
| gl_FragColor = vec4(finalColor, 1.0); | ||
| } | ||
| `; | ||
|
|
||
| // cachedMaterial is used to store the material so that it is only created once for every color | ||
| export const cachedMaterials: { [color: number]: ShaderMaterial } = {}; | ||
|
|
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| // TODO: remove the cache or add a way to clear it | ||
|
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| export function createColorMaterial( | ||
| color: number, | ||
| ambient: number, | ||
| directional: number, | ||
| brightness: number | ||
| ): ShaderMaterial { | ||
| // Check if the material for the given color is already cached | ||
| if (cachedMaterials[color]) { | ||
| return cachedMaterials[color]; | ||
| } | ||
| console.log('createColorMaterial. not cached'); | ||
|
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| const material = new ShaderMaterial({ | ||
| vertexShader, | ||
| fragmentShader, | ||
| uniforms: { | ||
| uColor: { value: new Color(color) }, | ||
| ambient: { value: ambient }, | ||
| directional: { value: directional }, | ||
| brightness: { value: brightness }, | ||
| clipMinY: { value: -Infinity }, | ||
| clipMaxY: { value: Infinity } | ||
| } | ||
| }); | ||
|
|
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| // Cache the material | ||
| cachedMaterials[color] = material; | ||
|
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| return material; | ||
| } |
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