In my project I need to display three lasers which draw straight lines on surfaces. These 3 lasers’ sources are placed in a way that their emitted planes intersect in exactly one point - just like in the Cartesian coordinate system where the intersections of the XY, XZ and YZ planes mark the origin and the intersections of two of the planes mark lines - the axes.
Dividing the problem in its parts it would be simple if there is a possibility to draw a line on the object the laser hits. The only requirement is that the line fits to the surface of the object - just like the equator is a line which is projected on the sphere.
I have successfully created a particle system which forms a laser beam. When the laser hits an object the beam target point is set to the intersection’s location. But I have no clue how I can draw another beam/line/something else that adapts to the surface it is impinging or how I can specify a shape for the laser so that it is emitting particles in a plane within an angle of e.g. 10 degrees to the left/right of the forward vector.
Thanks in advance!