How to display only one slanted plane？

[kt7456]

i mean cut into a face or a plane ，like below

[kt7456]

cut into slanted planes

[Twinklebear]

It sounds like you mean the same as https://github.com/Twinklebear/webgl-volume-raycaster/issues/9#issuecomment-1478817045 , to draw the volume texture on just a plane that cuts through it. You'd do as I mention in that comment, draw a plane and then look up its coordinates in the 3d volume to texture it with the volume texture

[kt7456]

i forget say thanks！