Help - world to camera space

[Thomas.]

Please, how can I get vector from world space in camera space?

[EgonOlsen]

By using this method: http://www.jpct.net/jpct-ae/doc/com/threed/jpct/Camera.html#transform(com.threed.jpct.SimpleVector)

[Thomas.]

I somehow missed this method But I need transform normalized vector, this method works with SimpleVector like with a point in world space, not like a vector.

[EgonOlsen]

If it's about the direction only, just multiply the vector in question with the matrix returned by Camera.getBack().

[Thomas.]

Thanks I have two working versions.

This version seems be faster

Code: [Select]

SimpleVector vec = new SimpleVector(dir);
Matrix back = cam.getBack();
back = back.invert();
vec.matMul(back);
and this also working

Code: [Select]

SimpleVector xA = cam.getXAxis();
SimpleVector yA = cam.getYAxis();
SimpleVector zA = cam.getZAxis();
SimpleVector vec = new SimpleVector();
vec.x = dir.x * xA.x + dir.y * xA.y + dir.z * xA.z;
vec.y = dir.x * yA.x + dir.y * yA.y + dir.z * yA.z;
vec.z = dir.x * zA.x + dir.y * zA.y + dir.z * zA.z;

[EgonOlsen]

The first version is actually wrong. You are doing a transformation from camera space to world space that way. Leave out the invert()-call.