Raycast Distance

Questions & Answers
1

I have a ball with radius .15, I am trying to cast a ray forward from its center with distance .2 and if it hits something I want that somethings information. This is the line of code Physics.Raycast(down.position, down.forward *.2, hit, 1) it is in an if statement, and it doesn’t work. When I press play the ray seems to reach out too far and hit other objects, so either I am doing this wrong(and I have tried the many versions of Raycast) or the scale of the scene is different which I dont think is the case because I draw a ray with all the same properties and it only extends .2. So anyone know Rays better than I do?

EDIT: I’ve added a picture. The green ray, is what is what the ray is supposed to be doing. The two highlighted objects are gate1 and gate2, and red ray is the result when I try Debug.DrawRay(hit.point, hit.point, Color.red, 120); the game seems to think that “hit” in this case is gate2, and completely ignores gate2

[3508-screen+shot+2012-09-14+at+4.06.27+pm.png|3508]

2

Rays have infinite length. Multiplying the magnitude of the vector would do nothing, as the ray would be infinite anyway. Use RaycastHit.distance to check whether the collision happened within the distance you wanted. Or use

Physics.Raycast(transform.position, -Vector3.up, hit, 0.2f)

to cast a ray straight down, limiting possible collisions to 0.2 world units only.