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DX11 Instancing - Only render certain instances

2 posts in this topic

Hi guys!

So, imagine you have a scene with 1000 trees and your rendering it with instancing, quite a lot, and you wan't to implement a lod system. Now your lod system is actually done, but now how do you change the buffers for that tree (the one too far away).

Illustration (real):

Now as you see I have quite a lot of trees there, but now I only wan't some of those trees from my instanced buffer to be rendered. As I understand you have to update the buffer, but wouldn't that be quite heavy, or do I have to split up the instanced buffer into chunks, and update those? Right below I'm gonna show you how I handle my rendering.


UberBuffer._instance = true;
UberShader.SendObjectBuffer(ObjectBuffer, devcon);
UberShader.SendUberBuffer(UberBuffer, devcon);
InstancedMesh[i]->SendInstancedData(ObjectBuffer, Camera, Bufferphase, devcon); // doesn't really matter for now, but if you wan't it, say it :)

bool changed = false;

for (int lod = -1; lod < InstancedMesh[i]->Lods.GetCount(); lod++) // we start from -1 as some meshes don't have lods, so we actually trick it!
	if (changed)
		InstancedMesh[i]->SendBuffers(devcon, dev, Camera, ObjectBuffer, Bufferphase);
		changed = false;

	if (lod > -1) // is this a lod?
		for (int instance = 0; instance < InstancedMesh[i]->instanceCount; instance++)
			if (sqrtf(D3DXVec3Dot(&*Camera->GetPostion(), &InstancedMesh[i]->instances[instance].pos)) >= InstancedMesh[i]->Lods.GetComputedADistance(lod)) // distance...
				InstancedMesh[i]->Lods.GetComputedLod(lod)->SendVIBuffers(devcon, dev, Bufferphase); // new vertex buffer
				changed = true;


	UberShader.Render(devcon, Bufferphase, true, InstancedMesh[i]->instanceCount); // Render Instanced, one line of code: devcon->DrawInstanced(Bufferphase.IndexCount, instanceCount, 0, 0);

	for (int inSM = 0; inSM < (InstancedMesh[i]->SubMeshes.size()); inSM++) // Sub meshes, doesn't really matter so much for now, I'll take care of those.
		InstancedMesh[i]->SendSubBuffers(devcon, dev, Camera, ObjectBuffer, Bufferphase, inSM);
		UberShader.Render(devcon, Bufferphase, true, InstancedMesh[i]->instanceCount);



Now for each Lod i check all the instances for the distance, and if the distance is larger, then apply the different vertex buffer. But somehow I only need to apply this vertex buffer to the instances affected by it!


Now how is this possible? blink.png


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I would try to just use two different vertex buffers, and you can stick with a single instance buffer.  The trick is to reshuffle your instance data to have all of the high LOD instances in a continuous block, while the lower LOD instances should be in a separate block (you could just as easily implement this with two instance buffers I guess...).  This takes two draw calls, but that isn't a big deal.


This would require modifying the data in the buffers, but it would only be necessary once in a while when the view is significantly moved.  If you store your instances in an intelligent order (like in a quadtree fashion) then moving the data around should be minimally intrusive and will let you quickly get through the update.


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