Large number of draw calls on road demo

[kfarr]

Hi there, I really appreciate the work you've put in to the road geometry creation logic, it seems to work very well. However I am seeing a large number of draw calls (it appears to be correlated with the # of lengthSegments and "segments" of road)

To reproduce issue:

• Go to sample "roadrace" scene, such as https://threeg-road.glitch.me/ or https://hofk.de/main/threejs/sandboxthreeg/RoadRace.html
• Open console
• Type in renderer.info.render and press enter
• Notice calls: 5006 (or similar number)

Impact:

• it is difficult for me to use this inside of a more complicated scene that is already draw call constrained
• For example opening this scene in an oculus quest results in dropped frames, ostensibly due to draw call count not total polygon count

Instead:

• is it possible to refactor the road creation functions such that only 1 draw call is used for the length of each segment? ie in this demo case there would be 5 draw calls regardless of lengthSegments value

Workaround:

• In the meantime I will try testing with much lower values for lengthSegments and curvePoints to see if I can get draw calls to a useable threshold with the existing code base

[hofk]

Sorry for the late reply.

I am currently not working on the project. The solution was based on a request. See https://discourse.threejs.org/t/create-a-curved-plane-surface-which-dynamically-changes-its-size/6161

I then added a variant to the addon.
https://discourse.threejs.org/t/addon-to-create-special-extended-geometries/1855/

I also had a similar performance problem. There is a reference to renderer.info.render there.
See https://discourse.threejs.org/t/jerky-camera-movement-with-many-objects/15168.
But I don't know much about the internals of three.js, I am not an expert.

You could be in the topic
https://discourse.threejs.org/t/create-a-curved-plane-surface-which-dynamically-changes-its-size/6161/ make a request.

We may receive an explanation and a suggestion for improvement from an expert.

[kfarr]

Thanks @hofk appreciate the project background info! I have some work to continue that doesn't depend on this but if it becomes a true blocker then I will dig in more and add more requests for help from others.