Instancing merged geometry

Questions
1

I have 3 BufferGeometries, 2 indexed and 1 is not.
I’m looking into combining them into a single geometry and instance it.
I’m having few issues with that:

  1. Each shape should have it’s own color
  2. Potentially (a flag?) I need to make the 2nd geometry invisible (I suppose that can be done using an instance attribute?)
  3. BufferGeometry doesn’t support merging indexed with non-indexed geometries.

Is there another way?
Maybe there is an example of combining multiple geometries with instancing?

2

Since you are going to use instanced rendering, you have to control the color via an instanced attribute. Same for the visibility control.

You could use BufferGeometry.toNonIndexed to create a non-indexed version of your two geometries. After that, the merge should work. Is this approach acceptable to you?

AFAIK, no.

3

I suppose that should work, but how do i control each shape with an instance attribute?
The geometry is now going to be merged and i have no notion of each shape.
Maybe I was misunderstood, think about a line with 2 connected boxes (on each side);
Say I merge those together, how can i give each box a different color and the line a different color?

4

I’ve never had this case when using instanced rendering. But i guess you need to find a way to create an instanced attribute “color”. Another solution is maybe the usage of a texture. These are the only options i can think of right now…

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