Library/Graphics/Intersections


 * Hit or not hit?
 * Number of intersections?
 * Tolerance parameters
 * Region intersections (using a cone rather than a line)
 * Return all intersections
 * Return only points or other complex shapes
 * Iterative or all parameters at once
 * Precision
 * Performance
 * Surface normal
 * Interior intersections (ray beginning inside a solid)
 * Two-sided surfaces


 * Animation


 * Nearest intersection
 * Gaps in objects
 * Sub-objects
 * "Virtual intersections" (behind a ray)