subfaced polygons and decal mode

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Chris Winters (cjw++at++stargazer.mak.com)
Tue, 18 Jun 96 17:28:36 EDT

Why is it necessary to call pfdMakeSharedScene() for .flt subfaced
polygons to properly use decal mode?

If pfdMakeSharedScene() is not called, flimmering will result. To
test, try "perfly -q0" using a model with subfaced polygons, such as
MultiGen's own smart_hog.flt.

The problem occurs with Performer 2.0 and 2.0.1, Flight loader 14.2 and
14.2a, Onyx RE2 and High Impact, IrisGL and OpenGL.

Note: even when calling pfdMakeSharedScene(), there will be a second
problem when using Performer2.0 on a High Impact: decal mode will be
enabled, but polygons will not be properly ordered in some cases.
This problem was fixed in Performer2.0.1, and does not appear on our
Onyx.

Chris Winters
Gil Irizarry

MaK Technologies
185 Alewife Brook Pkwy
Cambridge, MA 02138
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