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Docs: comment on line-sphere intersection

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Campbell Barton 2016-04-10 22:18:05 +10:00
parent 019ce363b0
commit 50f9681e15
1 changed files with 8 additions and 0 deletions
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source/blender/blenlib/intern/math_geom.c
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@ -839,6 +839,14 @@ bool isect_seg_seg_v2_simple(const float v1[2], const float v2[2], const float v
* \param l1, l2: Coordinates (point of line).
* \param sp, r: Coordinate and radius (sphere).
* \return r_p1, r_p2: Intersection coordinates.
*
* \note The order of assignment for intersection points (\a r_p1, \a r_p2) is predictable,
* based on the direction defined by ``l2 - l1``,
* this direction compared with the normal of each point on the sphere:
* \a r_p1 always has a >= 0.0 dot product.
* \a r_p2 always has a <= 0.0 dot product.
* For example, when \a l1 is inside the sphere and \a l2 is outside,
* \a r_p1 will always be between \a l1 and \a l2.
*/
int isect_line_sphere_v3(const float l1[3], const float l2[3],
const float sp[3], const float r,