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[1.17.1] Custom model rendering performance


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I have a BlockEntityRenderer and I am rendering an obj model using:

VertexConsumer vertexConsumer = iRenderTypeBuffer.getBuffer(RenderType.solid());
rendererProvider.getBlockRenderDispatcher().getModelRenderer().renderModel(matrixStack.last(), vertexConsumer, null, myModel, 255f, 255f, 255f, combinedLight, combinedOverlay, EmptyModelData.INSTANCE);

The performance is pretty terrible rendering it this way. If I instead use the same model as the blockstate model for the block then there are no performance issues. I ran a profiler and found it was spending all its time in com.mojang.blaze3d.vertex.VertexConsumer.putBulkData(). There must be some way to cache what putBulkData() is doing?

Just wondering if anyone has some thoughts on this, thanks.

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