protected override bool defineCmd()
{
JSIApp app = (JSIApp)this.mApp;
JSIPerspCameraPerson cp = app.getPerspCameraPerson();
// create a plane on the pivot, directly facing the camera.
Plane pivotPlane = new Plane(-cp.getView(), cp.getPivot());
// project the previous screen point to the plane.
Ray prevPtRay = cp.getCamera().ScreenPointToRay(this.mPrevPt);
float prevPtDist = float.NaN;
pivotPlane.Raycast(prevPtRay, out prevPtDist);
Vector3 prevPtOnPlane = prevPtRay.GetPoint(prevPtDist);
// project the current screen point to the plane.
Ray curPtRay = cp.getCamera().ScreenPointToRay(this.mCurPt);
float curPtDist = float.NaN;
pivotPlane.Raycast(curPtRay, out curPtDist);
Vector3 curPtOnPlane = curPtRay.GetPoint(curPtDist);
// calculate the position difference between the two points.
Vector3 offset = curPtOnPlane - prevPtOnPlane;
// update the postion of the camera.
cp.setEye(cp.getEye() - offset);
return(true);
}
protected override bool defineCmd()
{
JSIApp app = (JSIApp)this.mApp;
JSIPerspCameraPerson cp = app.getPerspCameraPerson();
float dx = this.mCurPt.x - this.mPrevPt.x;
float dy = this.mCurPt.y - this.mPrevPt.y;
float dAzimuth = 180.0f * dx / Screen.width;
float dZenith = -180.0f * dy / Screen.height;
// Quaternion qa = Quaternion.AngleAxis(dAzimuth, Vector3.up);
Quaternion qa = Quaternion.AngleAxis(dAzimuth, cp.getUp());
Quaternion qz = Quaternion.AngleAxis(dZenith, cp.getRight());
Vector3 pivotToEye = cp.getEye() - cp.getPivot();
Vector3 nextEye = cp.getPivot() + qa * qz * pivotToEye;
Vector3 nextView = qa * qz * cp.getView();
cp.setEye(nextEye);
cp.setView(nextView);
return(true);
}