GLTF Renderer: use primitive start vertex for indexed primitives

TheMostDiligent · TheMostDiligent · commit abece91e6dfa · 2025-11-06T21:03:15.000-08:00
diff --git a/PBR/src/GLTF_PBR_Renderer.cpp b/PBR/src/GLTF_PBR_Renderer.cpp
@@ -768,7 +768,7 @@ void GLTF_PBR_Renderer::Render(IDeviceContext*              pCtx,
             {
                 DrawIndexedAttribs drawAttrs{primitive.IndexCount, VT_UINT32, DRAW_FLAG_VERIFY_ALL};
                 drawAttrs.FirstIndexLocation = FirstIndexLocation + primitive.FirstIndex;
-                drawAttrs.BaseVertex         = BaseVertex;
+                drawAttrs.BaseVertex         = BaseVertex + primitive.FirstVertex;
                 pCtx->DrawIndexed(drawAttrs);
             }
             else

Original file line number	Diff line number	Diff line change
`@@ -768,7 +768,7 @@ void GLTF_PBR_Renderer::Render(IDeviceContext* pCtx,`
`768`	`768`	`{`
`769`	`769`	`DrawIndexedAttribs drawAttrs{primitive.IndexCount, VT_UINT32, DRAW_FLAG_VERIFY_ALL};`
`770`	`770`	`drawAttrs.FirstIndexLocation = FirstIndexLocation + primitive.FirstIndex;`
`771`		`- drawAttrs.BaseVertex = BaseVertex;`
	`771`	`+ drawAttrs.BaseVertex = BaseVertex + primitive.FirstVertex;`
`772`	`772`	`pCtx->DrawIndexed(drawAttrs);`
`773`	`773`	`}`
`774`	`774`	`else`