Set the rotation center point in model target editor when create guide view

Hi @T.Nakamura ,

I could report such request but need first to be sure what is the goal there. Following points:

1,) in the target generation we do not rotate or move the model but we will rotate the view point about the center of the model and also we can move it. From standard orientation when we go to the Model Target generator we wil start with default view point -  I belive it is zoom fit and looking form [1,1,1]in direction [-1,-1,-1] If you want to know exactly what iit s th default postion you can check the eyepos,eyedir and eyeup vector in the tracking event command:

tml3dRenderer.setupTrackingEventsCommand (function(target,eyepos,eyedir,eyeup) {//print to console here the vectory 
console.warn('eyepos=',eyepos)
console.warn('eyedir=',eyedir)
console.warn('eyeup=',eyeup)
 }) 

2.) currently we can rotate in the view about he screen center with the RMB(right mouse button) holding and horizontal about the screen Y and vertical about screen x . Holding the LMB(left mouse button) we can move the model in mouse direction. Zoom then with scrool button

3.) based on zoom rotation about screen x,y and movement in x,y direction we can move an rotate the model in any possible direction and have any possible rotation. So far my expirience . But this is only setting of the possition of the viewpoint and the viewvector and it is not a real rotation. 

4.) OK the rotation is  possibly not exact  and you need to have more sequential operations of move and rotation to get the desired rotations. 

So what is the goal here? Is that to have more effizient way to do this rotation more exactly - so means to calculate the new postion of the viewpoint and direction? So means you want to have a postion where you want to specify the rotation point. But possibly not only about x,y screen but some handle like model/modelItem UI in design mode where you can specify the x,y,z,rx,ry,ry, What mean that this could be more accorately approach for your intent to move and rotate the view.?

by the way I want to  mention that  in the UI we can rotate the model only about default csys. Rotation about a space point different from the standard csys is that what need to be a compbination form different movements and rotations which need to be calculated - euler tranformation.