Hi,
I have to build a pipeline on a Bezier path. My profile is a circle.
For each point of the Bezier curve I have the tangent normalized vector.
I will draw the pipeline with GL_QUAD_STRIP.
So e.g. for each point "i" of the curve, to calculate the vertexes of one
circle (which can be rotated anyway on the 3 axes), I iterate from 0 to 360
degrees and get
bP[0] = mPath[i][0]; // the point on the bezier path
bP[1] = mPath[i][1];
bP[2] = mPath[i][2];
bT[0] = mTangent[i][0]; // the tangent on the bezier path
bT[1] = mTangent[i][1];
bT[2] = mTangent[i][2];
for(slice = 0; slice <= mSlices; slice++){
radAngle = (angle * slice);
circleP[0] = 0.0; // bP[0];
circleP[1] = sin(radAngle) * radius;
circleP[2] = cos(radAngle) * radius;
// So now, how to rotate this point according to the
// tangent "bT" ?
}
I have already built my 4 x 4 rotation matrix but since it requires the 3
rotation angles, I am forced to calculate them with e.g.
angleY = atan2(-bT[2], bT[0]),
and as you know in case of bT[0] = 0 or bT[2] = 0 I get wrong values. Is any
other simpler way to do it using only the tangent values?
Is other function working better than atan2?
Best Regards
--
Lorenzo
email: email@hidden
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