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What's the draw call if I use material instances for a static mesh?

Hello everyone,

I just create a static mesh using BSP geometries and I assigned material instances for the surfaces. When I created a static mesh from the BSP, the mesh has 6 materials but all of them are material instances from the same base material. In this case, what's the draw call? Is it optimized or should I look for another solutions for the optimization such as creating model in a 3D program?

Product Version: UE 4.20
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asked Jan 23 '19 at 12:39 PM in Using UE4

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Core21.
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In the case of a BSP you will have the same amount of drawcalls if you have material instances for the faces since each face of the bsp has a drawcall. For instance a cube has 1 drawcall for each visible face while a mesh will have 1 drawcall for the mesh and 1 procedure call for each shader applied to it (2 drawcalls in total if you have 1 material instance for each face if each they are based on the same parent).

As a rule of thumb, use bsps only while prototyping/blocking your levels, but you are always better off with externally created static meshes (You can also generate a static mesh based on your bsp in the settings of the brush you are editing).

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answered Jan 23 '19 at 02:29 PM

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Bariudol
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avatar image Core21. Jan 23 '19 at 03:29 PM

Thank you for the answer.

I created just basic shapes, so I thought of making those meshes using BSP instead of using any 3D programs; and I converted them into static meshes afterwards.

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