C Function to Calculate Surface Normals

Posted on 2003-03-19
Medium Priority
Last Modified: 2013-12-26

I'm trying to write a function in C++ to calculate a surface normal and return the normal as a 3 element array.  The function takes 9 arguments- the coords of the point at which the normal is to be calculated and the coords of two points on the vectors of the sides.  I have the maths to do this, the trouble is I can't find a neat way to return the results...  I just need a 3 element array!

Question by:mrpink123
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Accepted Solution

TGGC earned 200 total points
ID: 8168519
a fast way

void cross( float x1, float y1, float z1,
            float x2, float y2, float z2,
            float x3, float y3, float z3,
            float& x, float& y, float& z );
  x= ...
  y= ...
  z= ...

a nice way (i would prefer this!)

struct Vec3
  float x;
  float y;
  float z;

void cross( Vec3 V1, Vec3 V2, Vec3 V3, Vec3& Result);
  Result.x= V2.y - V1.y * V3.z -...
  Result.y= ...
  Result.z= ...

Expert Comment

ID: 8172542

D3DXVECTOR3* myFunction()

D3DXVECTOR3* vecs = new D3DXVECTOR3[3];

  return vecs;

Or ?

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