[Urgent] API for mouse coordinate to world coordinate

[williamlai3a]

Is there any API in the game engine can convert the mouse coordinate to world space coordinate??
I mean like glUnProject in OpenGL.
This is because I am develop a game which need the player to click on screen to build things on the map.

Thxs a lot for the one who can answer.

[JP]

Check out the ISceneCollisionManager in the API, it's got functions that allow you to cast a line from the mouses position and see which nodes in the scene it collides with, if you check the line against all nodes in the scene then you'll get the 3D position.

[rogerborg]

What's so [Urgent] about this?

Use ISceneCollisionManager::getRayFromScreenCoordinates() to create a ray.

Then either use ISceneNodeCollisionManager::getSceneNodeFromRayBB() to find the nearest scene node that the ray intersects.

And/or ISceneNodeCollisionManager::getCollisionPoint() to find the intersection of the ray and a triangle selector (or a collection of triangle selectors held in a meta triangle selector).

See example 07. Collision for usage of these.

Alternatively, you may need to collide the ray with a plane. Create a suitable core::plane3df() and then use plane3d::getIntersectionWithLine() or plane3d::getIntersectionWithLimitedLine() to find the intersection point.

If you need [Urgent] help, then Irrlicht's IRC channel is a good place to ask.