Render Target Displaying Random Texture

Questions
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1

An object in my scene has a material that’s showing a texture never supplied to it - it’s showing a texture from a separate, unrelated object/material.

I render the scene to a cube render target, then assign:

const obj = new Mesh(geo, material);
material.map = rt.texture
material.needsUpdate = true

I captured a similar effect in this test below:

You can see that the displayed texture is updating at a fixed rate as expected, but as the camera zooms, the texture on the cube randomly switches to something else. Why is this happening?

https://codesandbox.io/p/sandbox/pensive-moon-r8fm9c

2

Are you using .onBeforeRender anywhere ? It looks like it’s happening due to frustum culling or smth.

See if setting . frustumCalled=false on all meshed makes the problem stop . If so.. perhaps some bounding boxes aren’t set up right.

3

Before rendering I do:

// cube-camera-utils.js
camera.getWorldPosition(cameraWorldPos);
cubeCamera.position.copy(cameraWorldPos);
cubeCamera.update(renderer, scene);

Otherwise, it’s pretty straightforward, and .frustumCulled = false on the meshes doesn’t change anything. It does seem to depend on the camera’s view frustum near plane. If I increase the near value, I can trigger the effect from a farther away zoom.

I also found out if I comment out const SkyController = (which adds the sort of background cube that we’re inside of, with the plants on the faces) - if I comment that out, now at the same zoom, I get blinking instead of just a texture swap.

4

Assigning the map to the render target texture:

material.map = rt.texture

results in

WebGL: INVALID_OPERATION: bindTexture: textures can not be used with multiple targets, although it still displays, as the videos above show.

Setting material.envMap = rt.texture instead, produces no error and I cannot cause the issue to manifest at all.

Why does using map cause an error though? And how does it just put a random texture on the cube…

5

This example is really convoluted and it has an effect composer as well, which renders to a lot of targets. The issue is definitely triggered by this sphere not rendering, but i cant even find in which file it is to see whats going on. If you do as @manthrax suggests, it should at least still be rendering that object.

1 Like
6

Can you screenshot what you’re seeing?

There are three objects.
(1) a sphere rendering as expected in front of the camera
(2) a large cube acting like a “room” that the camera is inside of (it has a plant image on each inner face)
(3) a cube above the sphere which is displaying the render target, we can call the RT cube.

index.js - adds the sphere to the scene
sky-ctrl.js - adds the “room” cube to the scene
cube-camera-utils.js - adds the RT cube to the scene, and updates the texture via cubeCamera.update()