Shade Display Problem - persistent misalignment between shade surface and wire surface outline (far from origin)

[BrianJ (Brian James)]

@caddzeus

Is there any way to get the shaded view to display correctly and work with large coordinates?

If the model is very far from the world origin, the way the display is drawn both in terms of wireframe and render meshes gets effected. I don’t know of any way to prevent this and the reason when explained is highly technical. There are a couple forum threads where this is discussed…

Bug? Rhino isn't accurate far from origin

This is one of the things I have learned to live with, but never really understood… Why isn’t Rhino accurate when it is far from the origin? In example: I have a bunch of height curves far from origin and extract points and then select duplicates. Many duplicates found. Then I move the curves to origion and repeat. Now there are no duplicates… So why isn’t Rhino extracting the curve points accurately? To me it makes no sense that extracting a point that is located at X=5 500 000.002 should…

and

The pain with models far away from the origin

Thanks for the clarifications. This is a common issue. My speculation is the snapping issues you are seeing result because there is a large translation component in the view projection matrices. If you can share a model were the issue is particularly troubling, it should be easy to debug our code and see where the snapping calculation starts to fail. The good news is sloppy snapping bugs are often caused by sloppy coding practices when dealing with view transformations and we can probably f…

@dalelear comments on the second thread being the most important as he would be the one to change they way this works if possible.

To regenerate render meshes after moving a model closer to 0, use the techniques Mitch talks about above.