Thin Instance LinesMesh Question/Issue

Questions
1

I’ve been working on my g-code viewer and I wanted to provide a lighter weight rendering using linesmesh and not just boxes. I wanted to utilize thin instances to reuse existing code to render out the lines. In my application the linemesh thin instances show up but I get constant flickering.

I tried to put a PG together that lightly mimics the shader I have written and does thin instances but I can’t get the lines to show up. If you flip the flag to use a box it works fine. Any help would be appreciated because this would help me greatly.

Video of my app with thin instanced linesmesh https://youtu.be/K379DkCV2w4
PG : https://playground.babylonjs.com/#NLZ15C#5

2

I am not sure that thinInstances support lines, lets add @Evgeni_Popov their daddy in the thread.

3

I’m sure it is unintended but if you do
scene.performancePriority = BABYLON.ScenePerformancePriority.Intermediate

You can see the instances do exist. Would be great to see LinesMesh get thin instances support if it lacks it.

Thanks!

Edit: Could it possibly have to do with a lack of normals on the line?

4

This PR should do it:

1 Like
5

I made the changes in the PR locally and the thin instances are working! However, my shader does not appear to fully appreciate the linesmesh and has some artifacts that I am trying to chase down. But the instances themselves are working. Looks like

Edit: StandardMaterial causes the same effect.

2023-09-09_13-47-57
e

6

Looks like I’ll need to work a custom shader for the linesmesh thanks for your help! Looking forward to this change getting merged in.

7

Try to set the emissive color instead of the diffuse color. It’s probably the lighting which is causing the artifacts.

1 Like
8

You rock! Thank you guys for all your help!

  this.material.Fragment_Before_FragColor(`
     color = vec4(diffuseColor.rgb, color.w);
  `)

image
image1920×972 108 KB

1 Like