Ways to retrieve the previous location of a mesh

Currently, I am working on writing a shader to create the motionBlur effect in WebGL using the three.js framework. I am trying to adjust this particular tutorial for implementing WebGL: and extracting the velocity value with GPUComputeRenderer.

However, I am facing an issue with the following line:

Position = uModelViewProjectionMat * gl_Vertex;
vPrevPosition = uPrevModelViewProjectionMat * gl_Vertex;

I am unsure of how to obtain or compute the PrevModelViewProjectionMat. I understand that it involves projectionMatrix * modelViewMatrix * vec4(position, 1.0), but I am uncertain about acquiring the previous projMatrix or previous modelViewMatrix. Can anyone provide assistance?

javascriptthree.jsglsl

Answer №1

If you haven't made any changes to the camera settings (near, far, fov), chances are the projection matrix will remain unchanged from before.

To get the previous modelView matrix, either compute it or store it from the last frame. Afterwards, send it to the shader as a uniform for transformation.

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