ThinInstances and GlobalMatrix

Questions
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1

PG: ThinInstance & WorldMatrix | Babylon.js Playground (babylonjs-playground.com)

Hi, I have not been able to understand how to play with globalMatrix and ThinInstance.

I have more complex scenes but here i have reproduced one with just 9 cubes.

I create the array of all the worldMatrix of those 9 cubes.

I try to apply this array to a thinInstanceAdd but the result is not coinciding with the original scene.

If you comment line 53 ( matchingMeshes[i].dispose(); ) you can see the original meshes.

I have made a check of each matrix of the original meshes vs the thininstance, and the console shows 9 are ok, 0 are not.

Any help is appreciated!

This is an example applied to Petals. Original Meshes

petals1
petals1720×639 163 KB

Those are the thinInstances with worldMatrix applied

petals2
petals2719×637 140 KB

Thanks so much

(This is my first post, sorry for any non compliance :slight_smile:

2

You were close :slight_smile:
Call computeWorldMatrix to …well compute it. Otherwise, it will be updated lated when rendering.
Then, you can get it and use it for a thin instance.

1 Like
3

Wow. Thanks Great contribution. I Am almost there .

As you can see from this original image

image
image947×530 4.67 KB

Thin Instances are moved somehow bottom left
image
image868×584 6 KB

How to fix also that > And have the thin instances in the same position of the original mesh ?

4

yes, the original mesh is the ‘parent’ of the instances.