Hey there! I’m experimenting with TSL and instancedMesh and i’m kinda lost on how to get the instanceMatrix for each element when i replace the entire vertexNode Somehow now i’m doing const instMat = buffer(this.instanceMatrix.array, 'mat4', this.count).element(instanceIndex).toMat4().toVar() bu…

I recently spent some time trying the same thing (accessing the instanceMatrix for each instance of an InstancedMesh inside the vertexNode), and the short answer is: No, as of version 180 of three.js and after many days of research, I never found a way to get the original instanceMatrix. But, if ea…

What specifically are you trying to do with the instanceMatrix? I might be able to help depending on what you’re doing.

well, this is kinda useless in terms of the usage of instance matrix unfortunately because it takes in consideration just the position unfortunately. I need to have access on all the props, pos-rot-scale, like the good old way in GLSL :pensive_face:

Can you show a basic GLSL version of what you described.

wdym? gl_Position = projectionMatrix * modelViewMatrix * instanceMatrix * vec4(position, 1.0) I need to have access to that instanceMatrix in my vertexNode due the fact i’m replacing the entire node, so at some point i need to use the instance matrix value

here is a working THREE.InstancedMesh demo using three.webgpu.js and the THREE.WebGPURenderer https://editor.sbcode.net/0fe4af4ed949776580e57773d02ee2d46ee28c8d#L91-L95 And this is the vertex shader it creates. Maybe there is a clue in it. // Three.js r180 - Node System // directives // struct…

instanceMatrix in TSL // webGPU in vertexNode

Questions

torrent January 27, 2026, 2:19am 8

See this post: Will there ever be a "material.instancePositionNode" node?

Topic		Replies	Views
Title: How to Access instanceMatrix in Custom Vertex Shader with Three.js TSL (InstancedMesh)? Questions materials , shaders	6	587	January 27, 2026
Will there ever be a "material.instancePositionNode" node? Questions instanced-mesh , instancedmesh , tsl , instance-matrix , instancematrix , tsl-node	1	84	January 27, 2026
InstancedMesh TSL Questions tsl	1	168	January 17, 2025
Proposal: Post-instanceMatrix vertex transformation hook for InstancedMesh / BatchMesh Resources materials	8	236	January 27, 2026
"lookat" / "billboard" vertex shader for InstancedMesh instances? Questions sprite , lookat , instanced-mesh , instancedmesh , billboards , vertex-shader , tsl	7	332	August 16, 2025

instanceMatrix in TSL // webGPU in vertexNode

Related topics