Q: I received a new DWG drawing, but when opened in OptiWin it looks jagged and rough.
A: Some drawings have very large drawing coordinates, and the rendering system in OptiWin doesn't handle this too well.
Most of these drawings can be fixed with the CAD recovery function, available from the upper left part of the CAD window.
Q: I received a new DWG drawing, but it takes forever when I try to open it in OptiWin.
A: Some drawings contains mathematical representations of geometry (NURBS) which will take more processing power to display.
Another reason might be a lot of small elements, which reduces performance. Try a CAD recovery or reduce the drawing complexity.
Q: Objects in my CAD drawing keeps disappearing and reappearing!
A: This probably means that the drawing has a large number of elements, and the rendering system runs out of resources.
This can most likely be fixed by using the CAD recovery function which will gather all elements in one single block.
Q: I used the CAD recovery function but the drawing hasn't gotten any better!
A: CAD recovery is a semi-automatic function, which means that every action has to be confirmed.
A full recovery very often includes three steps: 1) check for problems, 2) audit/fix problems and 3) perform drawing adjustments.
Q: I received a very large and detailed 3D drawing but is unable to open it due to lack of system resources.
A: To conserve as much resources as possible when opening a 3D drawing try to lower the quality slider before opening the drawing.
It might also help to switch to surface rendering, because wireframe rendering is often slower on regular computer hardware.
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