Drawing black on whiteboard

IceLuna
Sun, 16 Aug 2020 19:56:45 +0000
Rendering

Hi! I’m making a whiteboard for my VR project and I want user to be able to draw black. Since Blend Mode of my brush is set to “Additive”, black color does nothing. Also I want user to be able to wipe the board. Any ideas how can I achive that? I attached 3 images: 1) Whiteboard; 2) Whiteboard’s material; 3) Pen’s material.
I have BP_Pen that creates M_Brush instance and draws material to RenderTarget and that RenderTarget is used in whiteboard’s material.

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