Hi, I have a question about Triangle-Triangle intersections. I've looked at other posts on the forum but they dont seem to fit what im after. I'm using java and I have 3d triangles, which store 3 Vertex objects, each vertex object stores a simple Vector(x,y,z) object. All the points in the mesh are normalised so they all the triangles are on a unit sphere. I am trying to write a simple triangle-triangle intersection method in java to test all of the triangles to see if they intersect. Is there any existing code to be able to do this, and i will i be able to do this with my current representation? Many Thanks! Dan

Or another way would be to determine if a point lies within the face of a triangle?

Have you already checked the book "Realtime Rendering" ?
A list of intersection methods (also triangle/triangle) can be found on the book's webpage:
http://www.realtimerendering.com/int/