Issue with Three.js Raycaster failing to intersect with a custom vertex shader

I'm currently working on implementing a particle system using a dedicated Vertex shader. I have provided a code example for reference: https://jsfiddle.net/dthevenin/7arntcog/

My approach involves utilizing a Raycaster for mouse picking to enable interaction with individual particles.

The code functions as intended until I attempt to adjust the position of a vertex directly in the Vertex Shader. In the provided example, I am passing a time value as a Uniform and modifying the x position based on that time's value.

    vec4 mvPosition = modelViewMatrix * vec4(position.x + time, position.y, position.z, 1.0);

Subsequently, the Raycaster fails to calculate intersections accurately.

To observe the issue, you can uncomment line 86; after doing so, clicking on a particle will not work correctly.

What might be the issue with this code or solution?

javascriptthree.js

Answer №1

When utilizing the raycaster intersection technique, your tests are conducted based on the original geometry.attributes.position vertex values before any alterations occur in the CPU or GPU. This means that any changes made to the vertex positions in the GPU won't be reflected in the raycasting process.

If you wish to displace your vertices and still perform raycasting after the displacement, you will need to regularly update the position attribute to ensure consistency between CPU and GPU calculations. You can refer to an official example demonstrating this method in action here. The provided code snippet highlights how to make your geometry dynamic:

const position = geometry.attributes.position;
position.usage = THREE.DynamicDrawUsage;

for ( let i = 0; i < position.count; i ++ ) {

    const y = 35 * Math.sin( i / 2 );
    position.setY( i, y );

}

While performing these calculations in the CPU is not as efficient as doing it in the vertex shader, it remains a straightforward solution for incorporating raycasting into your workflow.

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