How to reduce draw call of 3 lights model?

Questions
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1

Hello,
I have a .glb file which containt 3 doulble light, but need 18 draws to render.
How I can do with this file to reduce draw when render with Blender or GltfTransform?

Ray 2.glb (4.1 MB)

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image1531×556 18.8 KB

Thank you

2

Try reducing the amount of materials and their duplicates in Blender.

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3

After instacing into blender must be 2-3 draw calls. And if merge triangles into one gepmetry and merge textures into one then maybe 1 draw call

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4

If you open the model in https://gltf.report/ and then run the sample in the script tab, you’ll get it down to 1 draw call. This merges the (identical) lighting fixtures, which you might prefer to skip if you’ll be placing them throughout the scene. The script is comparable to running gltf-transform optimize in.glb out.glb and works by generating a small palette texture for all of the unique material colors:

image

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5

Hi Don,
Thank you. I tried and be very impresived.
Can I join all mesh but keep userdata on them ?

  • Scan and set userdata for all object: Allthing of light 1 will have a Userdata:‘light1’.
  • Continue with light 2,3,4…
  • → Join all of them to reduce draw but keep user data.
  • Click a position => raycaster check userdata of clicked area => send back console.
6

You can have one mesh for rendering, multiple meshes or just nodes for data/raycasting etc

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7

Maybe, but it will make everything else more complicated, you’d need to pack identifiers into vertex data. Until you are well over 100+ draw calls and sure it’s causing performance issues, I would not worry about that type of optimization yet.

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8

Yes,
My problem is I have to solve with 700 .glb files in to scene without lost interact with objects. I tried to load gltf norrmally, It raised to 8000 calls…
Server side: used blender and gltf transform to optimized them.
Client side: Load them and merged some file gltf less important. But “impotant file” still to much.
So I turn back to server to find the better way to solve

9

Raycast to not added to scene default not merged meshes with userdata. Added to scene will be only merged.

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10

Like I’m understanding. I have merged mesh and original meshs.
Merged mesh will be rendered to scene, original meshs add to scene but not render.
When click, raycast check data on original mesh. Right ?
About highlight object, will I render object from original mesh by glb scene node?
But if I want hide object, I need create custom atributes for vertexs.

11

This sounds about right, yes. I’d have a look at BatchedMesh as well. It takes some work to set up correctly, but would allow you to show/hide individual objects while still drawing them in batches.

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12

image
image1600×484 27.9 KB

I added ID for meshes of each object like this.
So, I think I can merge them all to one mesh with same ID condition, that will reduce draw call.
How can I do this ?
Ray 3.zip (7.7 MB)

13

Hi everybody,
Finally I had some results from your advices.
To handle interaction with object and reduce draw call. I devide glb file by nodes. Then use Join to reduce draw call.
Now I have to solve logic about view with instancedmesh. But seem looks like it has a solution. :slight_smile:
Thank you everybody

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