ArcScene: Problem when a Raster floating on a TIN surface

[XiaodongZHAO]

When I attempt to display a raster layer that floating on a TIN surface, the result is not right. There is some strange graphics around the raster.
The raster is geodatabase raster format in the Personal or File geodatabase.
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[JeffreySwain]

Be sure to select the proper raster resolution when selecting the TIN as the display choice.  Also be sure to select the drawing priority order if you are getting the TIN to 'bleed' through.

[XiaodongZHAO]

Thanks for your help.
I want to display a raster floating on a TIN, the Raster Resolution button (grey )cannot use in this case. The drawing priority order do affect the result, but it is not the right result.
In fact, I found that the order of adding  the data is important. When I add a raster first, then a Tin, it is OK to disaplay the raster floating on the TIN. Otherwise, it is the display result as the above.
I don't know why, but it is true. Is it a BUG?

[JeffreySwain]

This might be do to the fact the TIN is not in a coordinate system.  I would check to see if the TIN is projected or not.  You do not even need the TIN in the scene in order to display it in 3d.  You can just simply path to it.  Try that and see if you are getting the desired results.

[XiaodongZHAO]

This might be do to the fact the TIN is not in a coordinate system.  I would check to see if the TIN is projected or not.  You do not even need the TIN in the scene in order to display it in 3d.  You can just simply path to it.  Try that and see if you are getting the desired results.

Thanks a lot!
Both the TIN and the Raster are projected on a same coordinate system, see the attached picture. But it is a custom system.
If you add the raster first, everything is OK. If you add the TIN first, then remove it again, add the raster and path to the TIN, the result is not right.
Anyway, I have found a way to avoid it.
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