Collision Ray from 2 points

Scripting Issues
1

Hi everyone!

I’ve come up with a little issue during my development with panda.
I want to generate a CollisionRay from two given points (That is, one is
the origin and the other one determinates the direction).

I read from reference that the last three parameters for a CollisionRay are
dy,dx and dz. How can I generate a vector for this from two given points?

I’ve never dealt with 3D vectors so far, so I’m not sure on what to do.

Thanks in advance!

2

Unless I’m missing something, you should just be able to use the vector. Fundamentally a vector contains the same numbers as a point, but the interpretation is that a vector represents a triple of distances from a point (in this case the collision model origin) rather than coordinates in absolute space. If you can generate the vector (point_B - point_A) you should absolutely be able to use its x/y/z explicitly, and Panda may even let you just pass the whole Vec3 in as an argument.

3

A vector is the difference between two points. If you subtract a Point3 and a Point3, the result is a Vec3, and this is indeed accepted by the CollisionRay constructor.

David

4 
start_point = Point3() #start of the ray
other_point = Point3() #some other point on the ray

vector = other_point - start_point
vector.normalize() #just in case

ray = CollisionRay()
ray.setOrigin(start_point)
ray.setDirection(vector)

...