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I'm making something like "Low poly" style game. For that, I'm using multiple materials for each mesh without uv mapping and texturing.

Luckily, only weapon does this, others not. Also it's first person shooter so most of time, it just 7~8 materials requires for rendering.

However, I heard that lots of materials causes more rendering for GPU and it cause performance issue. My target platform is Android, and that could be a big problem.

Should I change all my weapons to have single material each?

This is the screenshot of my game. As you can see, single weapon uses 6 materials.

enter image description here

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    \$\begingroup\$ Each material change usually means a new draw call, so there is a cost to it. Can you try including a sample of the visual look you want your weapons/other models to have? It might be possible through vertex colours or other means. \$\endgroup\$ – DMGregory Jan 27 '18 at 21:14
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    \$\begingroup\$ Yes this is true, performance should increase if all weapons are drawn in a single 'batch' with one material. 8 materials does not sound like a lot though. \$\endgroup\$ – Jay Jan 28 '18 at 1:12
  • \$\begingroup\$ @DMGregory Sure, I just added screenshot. \$\endgroup\$ – modernator Jan 28 '18 at 6:25
  • \$\begingroup\$ @Jay Okay thanks. Than should I change all my models to have single material with uv mapped + textures? I already made almost 10 weapons :( Is there a way to make fix this more quickly? \$\endgroup\$ – modernator Jan 28 '18 at 6:27
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    \$\begingroup\$ Oh yeah, if you have 6 materials per weapon then you should look at cutting that down. The number of materials in your whole scene will be a contributing factor as well. \$\endgroup\$ – Jay Jan 28 '18 at 7:17
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As the comments on the question indicate, multiple materials require more rendering costs. I fixed this issue by integrate multiple materials for each model one by one.

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