picking - sending ray from camera, depending on mouse coords

[Melsiu]

Hi..
I am working on first person shooter game engine, i need to create ray from camera. I know only camera's angle, origin, and the screen coordinates of mouse cursor. Do anyone know how can I calculate the ray direction?
thanks in advance[/u]

[shadowslair]

Code: Select all

// from mouse coordinates:
core::vector2d<s32> mousePos( X, Y);
core::line3d<f32> yourRay = smgr->getSceneCollisionManager()->getRayFromScreenCoordinates(mousePos, yourCameraOrNorhingForActiveCamHere);

Your ray direction in this case is core::vector3df dir = (ray.end - ray.start).normalize();
But usually you want to shoot from the screen center, so you can directly use camera +z vector. Please take a look at the irrlicht-1.7.1\examples\07.Collision to have some better explanation. As a whole, you can use the collision demo as a base.

Please post such questions in the "Beginner`s help" section. Thank you and good luck! See ya around...

[Melsiu]

uhm...
I asked for the mathematical solution for my problem, and not for the irrlicht funtion name .
nvm Ill check out the source of getRayFromScreenCoordinates...

[hybrid]

In that case this is the wrong forum, moving to games forum.