3D Perlin Noise Simulation

Mesmerizing swirls of noise-generated volumetric forms

The error "WebGL: INVALID_OPERATION: useProgram: program not valid" typically occurs when there is an issue with the shader compilation or linking process. In this case, the error is likely caused by a mismatch between the vertex and fragment shader precision qualifiers for the `sampler3D` uniform. The vertex shader doesn't have any precision qualifiers, while the fragment shader uses `highp` precision for `sampler3D`. To fix this, you can add the same precision qualifiers to the vertex shader: ```glsl precision highp float; precision highp sampler3D; varying vec3 vOrigin; varying vec3 vDirection; void main() { // ... } ``` Now both the vertex and fragment shaders have consistent precision qualifiers for `sampler3D`. Additionally, make sure to set `texture.needsUpdate` to `true` after creating the 3D texture: ```js const texture = new THREE.Data3DTexture(field, size, size, size); // ... texture.needsUpdate = true; ``` This ensures that the texture is properly uploaded to the GPU before being used in the shader. With these changes, the shader should compile and link successfully, and the "program not valid" error should be resolved. If you still encounter issues, you can try the following: 1. Check the browser console for any additional error messages related to shader compilation or linking. 2. Verify that the shader code is free of syntax errors and that all variables and uniforms are properly declared and used. 3. Make sure that the `field` array has the correct size and format, matching the dimensions and type specified in the `THREE.Data3DTexture` constructor. 4. Double-check that the `map` uniform is properly set in the `ShaderMaterial` and that the texture is correctly bound to the shader. If the issue persists, please provide more details about the specific error message or any additional code that may be relevant, and I'll be happy to assist you further.