70002820 Improve the user action pan and rotate 3d scene performance in 3d rendering mode

Summary

Improve the user action pan and rotate 3d scene performance in 3d rendering mode

Solution

The most heavy in 3d rendering of a drawing is the transparency(AlphaBlending)  of the objects color
Generally the transparency needs the objects to be render twice
You can temporary disable it during the user pan and/or rotate 3d scene as follow

Also you can ignore the draw of specific figures during the pan and rotate3d actions
And also you can increase the TimerBreakForDraw value to a bigger one to avoid flickering (default value is 85 milliseconds)

doc.GlobalRenderProperties.TimerBreakForDraw = 120;
            doc.FreezeEntityDrawEvents.Push(false);//needed if you need to override the OnDrawFigure event
            doc.ActionStart += Doc_ActionStart;
            doc.ActionFinish += Doc_ActionFinish;

private void Doc_ActionFinish([System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.IDispatch)] object sender, [System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.IDispatch)] object action)
        {
            if (action.GetType().FullName != "VectorDraw.Professional.ActionUtility.ActionPan" && action.GetType().FullName != "VectorDraw.Professional.ActionUtility.ActionDynamicRot") return;
            doc.GlobalRenderProperties.IgnoreTransparency = false;
            doc.OnDrawFigure -= Doc_OnDrawFigure;
            doc.Invalidate();//refresh the screen with normal objects display
            
        }

        private void Doc_ActionStart([System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.IDispatch)] object sender, string actionName, ref bool cancel)
        {
            if (actionName != "BaseAction_ActionPan" && actionName != "BaseAction_ActionDynamicRot") return;
            doc.GlobalRenderProperties.IgnoreTransparency = true;//ignore the transparency for faster redraw
            doc.OnDrawFigure += Doc_OnDrawFigure;
        }

        private void Doc_OnDrawFigure(object sender, vdRender render, ref bool cancel)
        {//disable the draw of text and dimensions and 2d polylines objects
            if (render.IsWire2d) return;
            if (render.IsCreatingList) return;
            if (sender is vdPolyline || sender is vdText || sender is vdDimension)
            {
                cancel = true;//do not draw the figure
            }
        }

 
  

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