Problem with using csm_PositionRaw and InstancedMesh about three-customshadermaterial HOT 9 CLOSED

Ahh yes, instanceMatrix is not available if not used with InstancedMesh. Glad it’s solved 😄

from three-customshadermaterial.

csm_PositionRaw is the same as gl_Position thus, to use it with InstancedMesh, you need to multiply the position with the instanceMatrix before projection

csm_PositionRaw = projectionMatrix * modelViewMatrix * instanceMatrix * vec4(position, 1.0);

Let me know if this fixes your issue

csm_Position is the prefered way to override vertex position as you dont need to project or multiply the instanceMatrix to it, it is done for you.

from three-customshadermaterial.

@FarazzShaikh thanks for reply 🙏
It's very strange, but I get an error:
ERROR: 0:472: 'instanceMatrix' : undeclared identifier

instanceMatrix it should be because I tried to declare attribute mat4 instanceMatrix; it and got an error
ERROR: 0:394: 'instanceMatrix' : redefinition

csm_Position is the prefered way to override vertex position as you dont need to project or multiply the instanceMatrix to it, it is done for you.

I'm working with csm_PositionRaw because I need to convert the vertex position to world coordinates, and csm_Position needs to be passed to local coordinates.

from three-customshadermaterial.

What is your baseMaterial? Can you make a Sandbox (https://codesandbox.io/)? I will debug

from three-customshadermaterial.

Here: https://codesandbox.io/s/wizardly-neco-hczrcn?file=/src/App.tsx:869-976

It seems to work just fine. In my sandbox. Toggling "instanceMesh" in the controls will toggle the multiplication of the matrix.

from three-customshadermaterial.

@FarazzShaikh yeah, sorry for delay, I never used the sandbox)
My sandbox is working fine... strange.
https://codesandbox.io/s/kind-vaughan-thjnch?file=/src/index.js

ok, I will search and fix the error in my project.
Thank you so much for support.

Please do not close the Issue, later I will answer what the problem was 😀

from three-customshadermaterial.

Found the cause of the problem, I was used the material not only in InstancedMesh 🤦‍♂️

from three-customshadermaterial.

What was the solution?

from three-customshadermaterial.

What was the solution?

Use USE_INSTANCING preprocessor directive.

   #ifdef USE_INSTANCING
        vec4 vertexWorldPosition = modelViewMatrix * instanceMatrix * vec4(position, 1.0);
   #else
        vec4 vertexWorldPosition = modelViewMatrix * vec4(position, 1.0);
    #endif

from three-customshadermaterial.