Hello I'm ruben and I'm new to this forum

I have a problem with the calculation of the normal vector of a quad, my function for calculating the normal always return a vector with coordinates between -1 and 1, the lighting works and all but I want

to draw a line for each vector to see if everything is correct.

here is my function for getting the normal of a quad (i use the first 3 vertices of the quad because the normal points in the same direction anyway).

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| public void calculateNormal(float x1, float y1, float z1, float x2, float y2, float z2, float x3, float y3, float z3, Vec3f normal) { Vec3f a = new Vec3f(); Vec3f b = new Vec3f(); a.x = x1 - x2; a.y = y1 - y2; a.z = z1 - z2; b.x = x2 - x3; b.y = y2 - y3; b.z = z2 - z3; normal.x = (a.y * b.z) - (a.z * b.y); normal.y = (a.z * b.x) - (a.x * b.z); normal.z = (a.x * b.y) - (a.y * b.x); float combined = (normal.x*normal.x) + (normal.y*normal.y) + (normal.z*normal.z); float length = (float)Math.sqrt(combined); normal.x /= length; normal.y /= length; normal.z /= length; } |

Also the size of the terrain which im lighting is 1024*1024 (with a heightmap)