Updating the texture passed to a RawShaderMaterial uniform in Three.js after the initial rendering process

My Three.js scene uses a canvas as a uniform for a RawShaderMaterial. Once the scene is initially rendered, I modify the canvas by painting it red. Even though I set .needsUpdate = true; for the shaderMaterial, the points do not change color.

If I move the ctx.fill(); loop above the var material = declaration, the color does appear on the points.

Is there a specific procedure to update a canvas after the initial render when using the RawShaderMaterial? Any guidance on this issue would be greatly appreciated!

<html>
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javascriptthree.js

Answer №1

To update the texture values in the material and indicate that the material needs an update, you need to follow these steps:

scene.children[0].material.uniforms.c.value = retrieveTexture(canvases[0]);
scene.children[0].material.uniforms.d.value = retrieveTexture(canvases[1]);
scene.children[0].material.needsUpdate = true;

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