Is it possible to use a ShaderMaterial vertex.glsl to select a subset of points that have a y position above a specific number?

jcardella · October 13, 2021, 12:54am

I have a GLB file that I exported from Blender and have it imported into my ThreeJS scene. I have the GLB using a ShaderMaterial.

I would like to select a subset of points within the vertex.glsl that have a y position above a certain value (those in the box) so that I could have them animate in response to an event (load, click, unmount, etc).

Does anyone know of reference material, or strategies that show a way to select the subset?

bhushan6 · October 13, 2021, 7:57am

Maybe you can use smoothstep function of glsl, I mean it will give you 0 or 1 if vertex is out of limit you provide and then you can use that value with uniforms to do something ig

llttle_new_pencil · October 13, 2021, 9:48am

It is possible. And the clip effect use this way(pass uniform value and do a judgement, then discard pixel in fragment shader)

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Is it possible to use a ShaderMaterial vertex.glsl to select a subset of points that have a y position above a specific number?

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