Is there any way to set the per cylinder or per face colors in a cylinder Tube? I need this capability for fast rendering of a Tube which consists of potentially hundreds of cylinders, each with a different radius. I want the ability to change the color of each cylinder or some faces of a cylinder. …

If you use vertex colors, you don’t need multiple materials. Anyway, I’ve made a playground, does that look like what you have?: https://playground.babylonjs.com/#NREUQE#1

You should be able to use vertexColors for this Update Vertices - Babylon.js Documentation And you could even probably create them from parametric shapes: Parametric Shapes - Babylon.js Documentation

Yes, I am using a parametric shape: Tube. I just need ability to change the face colors of each cylinder in the Tube.

So yes, adding vertices colors would be the way to go a bit like here: https://www.babylonjs-playground.com/#ZRZIIZ#2

Hmm…, using Tube.getVerticesData would be a starting point. However, I need to locate the individual cylinders within the Tube, because each cylinder must have a unique color assigned to it. Would be a life saver if I can pass a material color array to the Tube constructor where each color in the ar…

If you set your wanted vertex colors, they will interpolate along each triangle from a vertex to the next one. Maybe it’s not what you want. If you call “face” the surface along a tessellation section and if you want real different colors per face, you’ll have to have twice more vertices (2 per edg…

[image] jerome: if you want real different colors per face Unfortunately, we don’t have an un-capped “ cylinder stacker ”. :wink: I think THAT is what Dn wishes to do, easily. Me, too. IF NOT making (inventing) a “cylinder stacker” (little tubes auto-assembled into path3d-following [bend-ab…

Wingnut, Based on Jerome’s description, I can see why we need to duplicate vertices to get per face color. I need each individual cylinder to have a distinct color and to be capped. I have built a series of cylinders and then used MergeMeshes with multimaterial being set to true to create a single…

[image] Dn_Jiang: I guess duplicating vertices is one of the reasons? Have you tried a tube.convertToFlatShadedMesh() ? Maybe look at a total mesh vert-count before and after. Depending upon what happens at the tube caps during the convert, I bet tube has 4x verts after the conversion. And…

Hi Gijis, A very clever way of assigning a unique color to an entire cylinder using vertex colors. I achieved the same result using per cylinder materials instead. However, the merged meshes created with both approaches suffer the same performance lag compared to a single built-in Cylinder Tube. In…

the cylinder stacker already exists for the Cylinder object. Just use the optional parameter hasRings. Is this what @Dn_Jiang wants ? or is this different colors along the tessellated vertical faces ? a PG would be nice to see what is the wanted goal

Per Cylinder or Per Face colors of a Cylinder Tube

Questions

JohnK January 7, 2020, 9:04am 17

This topic does something similar with SPS and cylinders Combining meshes without drawing them and performance issues. It is certainly worth reading and checking out the PGs.

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Per Cylinder or Per Face colors of a Cylinder Tube

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