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QuestionXna object Transformation. Pin
AghaKhan22-Oct-11 21:56
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Questionfree or affordable software for the editing of the photo [modified] Pin
anthonybates11-Jul-11 19:06
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AnswerRe: free or affordable software for the editing of the photo Pin
Drew Stainton11-Jul-11 19:38
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QuestionGraphics Plugin for Liquidity Risk Software? Pin
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Jokei want to Pin
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Questionhai Pin
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QuestionProblem with compression of a DirectShow video filter Pin
428814-Jan-11 8:05
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Question[OpenGL/MFC/C++] backface transparency... Pin
Maximilien11-Jan-11 6:02
memberMaximilien11-Jan-11 6:02 
(OpenGL on vs2008)
I'm drawing surfaces, not volumes. the issue is corruption (or maybe PEBKAC) when displaying "blended" (transparent)

I don't seem to understand how the surface must be "setup" to obtain full surface transparency on both the front side and back side.


I have something like :
 
::glReadBuffer( GL_BACK );
::glDrawBuffer( GL_BACK );
::glDepthFunc( GL_LESS );
::glEnable( GL_DEPTH_TEST );
 

// init.
glPolygonMode ( GL_FRONT, GL_FILL );
glPolygonMode ( GL_BACK, GL_FILL  );
glLightModeli( GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE );
glDepthMask( GL_FALSE );
glEnable( GL_BLEND );
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
 
glColor4ub( red, green, blue, alpha ); //valid values.
// draw the cone (render triangles)...

// cleanup...
glDisable( GL_BLEND );
glDepthMask( GL_TRUE );
glLightModeli( GL_LIGHT_MODEL_TWO_SIDE, GL_FALSE );
 

When using this code, there are some corruption in the display, surface "patches" are not rendered appropriately when displaying against "itself", for example a front facing polygon of a cone or cylinder which is displayed against a back" face of the same cone or cylinder.

see images showing the issue:
simple cylinder :
http://www.flickr.com/photos/thesorus/5346534862/in/photostream/[^]

and

a cone, a sphere and a plane.
http://www.flickr.com/photos/thesorus/5345924155/in/photostream/[^]


Max.

Thanks.
Watched code never compiles.

AnswerRe: [OpenGL/MFC/C++] backface transparency... Pin
jk chan14-Jan-11 5:42
memberjk chan14-Jan-11 5:42 
AnswerRe: [OpenGL/MFC/C++] backface transparency... Pin
parths19-Jan-11 3:49
memberparths19-Jan-11 3:49 
Questiontransparent using Fillpath Pin
transoft9-Jan-11 16:19
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AnswerRe: transparent using Fillpath Pin
Richard MacCutchan10-Jan-11 0:28
mvpRichard MacCutchan10-Jan-11 0:28 
QuestionOpenGL rendering on desktop [modified] Pin
Tcpip200519-Dec-10 2:17
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AnswerRe: OpenGL rendering on desktop Pin
parths22-Dec-10 23:28
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GeneralRe: OpenGL rendering on desktop Pin
Tcpip200524-Dec-10 3:06
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AnswerRe: OpenGL rendering on desktop Pin
Drew Stainton30-Dec-10 13:46
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GeneralRe: OpenGL rendering on desktop Pin
Tcpip200531-Dec-10 18:51
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Questiontransparently blit a bitmap Pin
mike7521413-Dec-10 10:01
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AnswerRe: transparently blit a bitmap Pin
LunaticFringe13-Dec-10 13:00
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AnswerRe: transparently blit a bitmap Pin
jk chan27-Dec-10 2:00
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QuestionGraphics.FillPath( Brush, GraphicsPath ) does not fill a simple Path. Pin
WDI28-Oct-10 3:47
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AnswerRe: Graphics.FillPath( Brush, GraphicsPath ) does not fill a simple Path. Pin
RaviRanjankr13-Dec-10 19:49
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Questiontool for real time graph plotting.. Pin
jainiraj27-Oct-10 2:21
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AnswerCross Post! Pin
Henry Minute27-Oct-10 2:41
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GeneralRe: Cross Post! Pin
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