Add Mass and Direction named control points for friction particles. Mass is body mass, direction is body velocity normal. CP0 is already setting position and contact normal Lower destroy time for effects Reorganize scrape data in surface def, lower default values. Don't fallback to rough by default. If it's a smooth scrape and there's no effects for that - do nothing by default Surface is considered smooth by default, can set roughness factor higher for rough surfaces... Get material for triangle by index for shape 2 on friction events should fix all friction events against world surfaces having hit surface be "default"