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For the image (bitmap) below,

enter image description here

if I do:

  1. Create a spite with the image in unreal engine.

  2. Create a opacity mask on the spite.

  3. Use this image, choose a specific color, such as blue, make its corresponding region the only opacity region on the mask.

My question is about the implementation of part 2 and part 3 in Unreal engine, they are quite confusing.

If anyone know how to implement it in unity, it would also be helpful.

Thanks a lot.

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  • \$\begingroup\$ It's unclear to me whether you're looking for a solution in Unreal (as described in your tags and step 1), or in Unity (as mentioned in your closing remark). Which is it? \$\endgroup\$ – DMGregory Sep 1 '20 at 15:17
  • \$\begingroup\$ I am looking for solution in Unreal, but if anyone can solve in unity, it could be a way to think about in Unreal. \$\endgroup\$ – Zizheng Yang Sep 1 '20 at 15:19

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