Sorted transparent billboards

New Message Reply Date view Thread view Subject view Author view

RWeyrauch%TSS%SwRI05++at++D15VS178A.SPACE.SwRI.EDU
Mon, 31 Oct 94 08:02:17 CST

Hello,

Is there anyway from within Performer to control the order in which the
geosets of a billboard are rendered? I'm using Performer to do some volume
rendering using transparent (blendfunction) billboards. I running Performer
1.2 on a Crimson RE with 1 RM.

Also, I have a question on using the PFTR_NO_OCCLUDE flag to control
transparency for a geostate. I tried to set the transparency for a geostate
using the following code:

pfGStateMode(gstate, PFSTATE_TRANSPARENCY, PFTR_BLEND_ALPHA |
PFTR_NO_OCCLUDE);

The billboards using the gstate are rendered using the alpha-blending, but
the billboards are still updating the z-buffer. I can get the transparency
mode to work if I call pfTransparency from a draw callback, but the
transparent billboards are no longer draw last.

Am I missing something?

Thanks for any help.

Rick Weyrauch rweyrauch++at++swri.edu
Southwest Research Institite
San Antonio, TX
(210)522-5776

New Message Reply Date view Thread view Subject view Author view

This archive was generated by hypermail 2.0b2 on Mon Aug 10 1998 - 17:50:37 PDT

This message has been cleansed for anti-spam protection. Replace '++at++' in any mail addresses with the '@' symbol.