# vector projection in 3D [closed]

p0, p2, p3, p4 are points in 3D and are connected on a straight line where p0 and p4 are fixed. How to find the normal at p2 and p3?

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## closed as unclear what you're asking by Josh Petrie♦May 14 '14 at 15:25

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You can create 2 vectores between your vertices. By taking the cross product of these 2 vectors you will get your normal. I'm not sure so someone should confirm if that is possible with your setup. Also is there a difference between node and vertice here? – Sidar Dec 21 '12 at 9:49
What do you mean by "normal to v2"? Are V1, V2, V3 co-linear or do they form a non-degenerate triangle? Please provide a slightly clearer picture to what you have and want to compute. – teodron Dec 21 '12 at 9:49
Do V1 and V3 already have an associated normal? If so, do you want to interpolate normals along a straight edge V1V3, or is V2 part of a more complex curve? – sam hocevar Dec 21 '12 at 10:08
I think you want to find more points on a path linking v1, v2 and v3, but we need more than that to help you. Do you have a definition of the surface in question, like a parametric definition or an equation? Could you clarify your question? – jrsala Dec 21 '12 at 16:37
...I can't make head or tails of this question. – Trevor Powell Dec 21 '12 at 22:50