Hot to use RenderTargetTexture to get result of custom material

[Rocan]

Oh no, I want to implement whether the calculation point in the shader is within a rectangular box, and output the result to the texture and extract it on the CPU side

I searched for relevant information and saw a similar link

Performance: clearing a texture quickly and texture rendering for simulation

The boid compute shader sample is in Compute Shaders | Babylon.js Documentation but it’s a 2D one and obviously only working in WebGPU. To clear a render target texture use engine.clear(...). Textures can’t be bound to thinInstanceBuffer, only arrays of numbers (Float32Array, etc). Textures must be passed as inputs to shaders. In WebGPU, storage textures can be filled by a compute shader and passed to the vertex/fragment shaders (but you must write your shaders with WGSL). See Writing shade…

about

What’s a simple way to do a compute shader without WebGPU?

Compute shaders are not supported in WebGL. You can do a RTT pass and fill your texture by the fragment shader.

I am too new to know how to implement it. It would be great if there were relevant examples