Moving 3D objects with the mouse
Blitz3D Forums/Blitz3D Beginners Area/Moving 3D objects with the mouse
| ||
| I’ve noticed that 2D mouse coordinates are not the same as 3D object coordinates. So it’s difficult to move a 3D object with the 2D mouse. I figured out a basic formula but when I scale the 3D object the simple formula no longer works. I’ve looked at a lot of different code to help me figure this out but it all seems to complicated for me at my present level of 3D programming knowledge. Is there a simple formula that takes the 3D object’s scale into account? Thanks |
| ||
| Well how about attatching an invisible object you don't need to scale, like say a vector, or a cube with alpha 0. Yall go easy on me now. |
| ||
| Just move the entity in relation to the CHANGE in mouse co-ordinates using the MouseXSpeed(), MouseYSpeed() and MouseZSpeed() commands. |
| ||
| There's an example in the code archives to move an object around on a plane parallel to the camera. I modified that function into this to move an object around on a ground plane: ; ----------------------------------------------------------------------------- ; Positions an entity in 3D from given 2D coordinates Function PositionEntityFrom2D(usecam,entity,x2d#,y2d#,height#=0,camZoom#=1) gw=GraphicsWidth() gh=GraphicsHeight() x#=-((gw/2)-x2d) y#=(gh/2)-y2d parent=GetParent(entity) EntityParent entity,usecam z#=Abs(EntityZ(entity)) div#=(gw/(2/camzoom))/z x=x/div y=y/div ;z distance determined by a straight line from camera, through xyz coordinates, to height TFormPoint x,y,z,usecam,0 y3d#=height x3d#=TFormedX() z3d#=TFormedZ() EntityParent entity,parent PositionEntity entity,x3d,y3d,z3d End Function ;----------------------------------------------------------------------------- |
| ||
| Nivek, this code should do what you want: http://www.blitzbasic.com/codearcs/codearcs.php?code=379 |
   |