Mon, 06/18/2018 - 21:42
Forums:
Hello. I need to rotate the whole scene by using a mouse. I am a little bit confused by a variety of Rotate functions found in V3dView class: https://www.opencascade.com/doc/occt-7.3.0/refman/html/class_v3d___view.html
I have found an example which just grabs mouse coordinates and directly places them into Rotate function, like this:
myViewInstance->Rotate(xMouseCoord, yMouseCoord);
myViewInstance->Rotation(xMouseCoord, yMouseCoord);The rotation is done way too fast for a slightest mouse move.
How does the rotation of view work? What is the difference between all these routines?
I have seen such routines for rotating point of view:
- Three Turn() routines
- Five Rotate routines
- One Rotation routine
- One StartRotation routine
- One SetEye Routine (it's as for a last resort)
How do I use these correctly to rotate a point of view?
Tue, 06/19/2018 - 19:36
> The rotation is done way too fast for a slightest mouse move.
Have you looked into standard samples coming with OCCT (MFC/Qt)?
Maybe you've forgotten calling V3d_View::StartRotation() before using V3d_View::Rotation()?
V3d_View::StartRotation() defines the center of rotation in 3D Viewer to rotate around it,
which is usually called at the moment of starting rotation event.
Thu, 06/21/2018 - 07:53
I am using MFC.
V3d_View::StartRotation() really helped.
So, when you make a click on pane, you should pass coordinates of mouse to V3d_View::StartRotation(). When mouse is moved and button is being held, you should pass mouse coordinates to V3d_View::Rotation().
This worked for me.