koobas.hobune.stream
Hit Angle Of Ray to Surface?
Ive been looking around but i have a weakness with angles in 3d space. How would i calculate the angle of a raycasthit to the surface it. I assume its utilizing the information from "hit" in the raycast, perhaps the normal data, but i dont quite know how to get it.
ahh perhaps i can use Vector3.Angle(ray direction, normal);
What you want is the dot product between the normal and your ray direction.
The dot product between two directions equals the cosine of the angle :
http://en.wikipedia.org/wiki/Dot_product
All you need to do is to take the direction of the ray and make a dot product with the normal from the raycast hit.
Ray r;
RaycastHit hit;
...
float cosine = Vector3.Dot(r.direction,hit.normal);
float cosineDegrees = Mathf.Acos(cosine);
actually the Angle function worked fine, it spits out a value going from 180 to 90 as steepness increases.
