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QuestionXna object Transformation. Pin
AghaKhan22-Oct-11 20:56
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Questionfree or affordable software for the editing of the photo [modified] Pin
anthonybates11-Jul-11 18:06
anthonybates11-Jul-11 18:06 
AnswerRe: free or affordable software for the editing of the photo Pin
Drew Stainton11-Jul-11 18:38
Drew Stainton11-Jul-11 18:38 
QuestionGraphics Plugin for Liquidity Risk Software? Pin
StaceyL21-Jun-11 10:46
StaceyL21-Jun-11 10:46 
Jokei want to Pin
yexiaofeng18-Apr-11 22:05
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Questionhai Pin
SR Baby31-Mar-11 22:32
SR Baby31-Mar-11 22:32 
QuestionProblem with compression of a DirectShow video filter Pin
428814-Jan-11 7:05
428814-Jan-11 7:05 
Question[OpenGL/MFC/C++] backface transparency... Pin
Maximilien11-Jan-11 5:02
Maximilien11-Jan-11 5:02 
(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 4:42
jk chan14-Jan-11 4:42 
AnswerRe: [OpenGL/MFC/C++] backface transparency... Pin
parths19-Jan-11 2:49
parths19-Jan-11 2:49 
Questiontransparent using Fillpath Pin
transoft9-Jan-11 15:19
transoft9-Jan-11 15:19 
AnswerRe: transparent using Fillpath Pin
Richard MacCutchan9-Jan-11 23:28
mveRichard MacCutchan9-Jan-11 23:28 
QuestionOpenGL rendering on desktop [modified] Pin
Tcpip200519-Dec-10 1:17
Tcpip200519-Dec-10 1:17 
AnswerRe: OpenGL rendering on desktop Pin
parths22-Dec-10 22:28
parths22-Dec-10 22:28 
GeneralRe: OpenGL rendering on desktop Pin
Tcpip200524-Dec-10 2:06
Tcpip200524-Dec-10 2:06 
AnswerRe: OpenGL rendering on desktop Pin
Drew Stainton30-Dec-10 12:46
Drew Stainton30-Dec-10 12:46 
GeneralRe: OpenGL rendering on desktop Pin
Tcpip200531-Dec-10 17:51
Tcpip200531-Dec-10 17:51 
Questiontransparently blit a bitmap Pin
mike7521413-Dec-10 9:01
mike7521413-Dec-10 9:01 
AnswerRe: transparently blit a bitmap Pin
LunaticFringe13-Dec-10 12:00
LunaticFringe13-Dec-10 12:00 
AnswerRe: transparently blit a bitmap Pin
jk chan27-Dec-10 1:00
jk chan27-Dec-10 1:00 
QuestionGraphics.FillPath( Brush, GraphicsPath ) does not fill a simple Path. Pin
WDI28-Oct-10 2:47
WDI28-Oct-10 2:47 
AnswerRe: Graphics.FillPath( Brush, GraphicsPath ) does not fill a simple Path. Pin
RaviRanjanKr13-Dec-10 18:49
professionalRaviRanjanKr13-Dec-10 18:49 
Questiontool for real time graph plotting.. Pin
jainiraj27-Oct-10 1:21
jainiraj27-Oct-10 1:21 
AnswerCross Post! Pin
Henry Minute27-Oct-10 1:41
Henry Minute27-Oct-10 1:41 
GeneralRe: Cross Post! Pin
jainiraj27-Oct-10 4:18
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