I have created a simple program that in theory creates
4 vertices and 2 triangles in a vertex and index buffer.
They are created with the correct flags.
I then create a custom material and pass them these buffers.
After i accomplish these things, I am not getting expected results. On my machine the vertices are not where i would expect them to be and it prints like half a mesh plane. On the Playground example i am not getting anything.
Could you take a look at my code and see where my gap is.
you do not set the position/index buffers for the compute shader (see lines 66-67 in the corrected PG below)
ComputeShader.dispatch will not dispatch the shader if it is not ready. You should use dispatchWhenReady instead, to be sure that the shader will be dispatched when it is ready.
I have inverted the definition of the 2 triangles in the index buffer, otherwise the triangles were defined backwards.
you must pass true for the 4th parameter of Mesh.setIndexBuffer because the index buffer is 32 bits
Thank you. That cleared up most of my understanding.
One more issue i did have though is the quad is not displaying flat on the ground like I would expect in your example. All the y values are 0 but the plane is not flat on the ground.
I edited your example and added a custom mesh defined from the CPU. Notice how there is a difference even thought the vertices and indices were defined the same. What is causing this?
For alignment reasons, array<vec3f> really is array<vec4f> (it’s coming from WebGPU, not Babylon), so you will have some unwanted 0 after each x/y/z positions. You should declare positionBuffer as an array<f32> instead:
Note that I’ve inverted the indices for the red plane, this way we can see both the red and black planes.
