Got interested in how to make this shape from [url=https://anitanh.tumblr.com/post/782989338212483072/collage-greeting-cards-by-anitanh]Anita's cool collage[/url].[br][br]The weird color triangle is because opacity is still not working in HSV mode. It uses barycentric coordinates. It's not all the colors, because R+G+B=1, but it's okay.