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QuestionXna object Transformation. Pin
AghaKhan22-Oct-11 20:56
memberAghaKhan22-Oct-11 20:56 
Questionfree or affordable software for the editing of the photo [modified] Pin
anthonybates11-Jul-11 18:06
memberanthonybates11-Jul-11 18:06 
AnswerRe: free or affordable software for the editing of the photo Pin
Drew Stainton11-Jul-11 18:38
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QuestionGraphics Plugin for Liquidity Risk Software? Pin
StaceyL21-Jun-11 10:46
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Jokei want to Pin
yexiaofeng18-Apr-11 22:05
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Questionhai Pin
SR Baby31-Mar-11 22:32
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QuestionProblem with compression of a DirectShow video filter Pin
428814-Jan-11 7:05
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Question[OpenGL/MFC/C++] backface transparency... Pin
Maximilien11-Jan-11 5:02
memberMaximilien11-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  );
glDepthMask( GL_FALSE );
glEnable( GL_BLEND );
glColor4ub( red, green, blue, alpha ); //valid values.
// draw the cone (render triangles)...

// cleanup...
glDisable( GL_BLEND );
glDepthMask( GL_TRUE );

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 :[^]


a cone, a sphere and a plane.[^]


Watched code never compiles.

AnswerRe: [OpenGL/MFC/C++] backface transparency... Pin
jk chan14-Jan-11 4:42
memberjk chan14-Jan-11 4:42 
AnswerRe: [OpenGL/MFC/C++] backface transparency... Pin
parths19-Jan-11 2:49
memberparths19-Jan-11 2:49 
Questiontransparent using Fillpath Pin
transoft9-Jan-11 15:19
membertransoft9-Jan-11 15:19 
AnswerRe: transparent using Fillpath Pin
Richard MacCutchan9-Jan-11 23:28
mvpRichard MacCutchan9-Jan-11 23:28 
QuestionOpenGL rendering on desktop [modified] Pin
Tcpip200519-Dec-10 1:17
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AnswerRe: OpenGL rendering on desktop Pin
parths22-Dec-10 22:28
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GeneralRe: OpenGL rendering on desktop Pin
Tcpip200524-Dec-10 2:06
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AnswerRe: OpenGL rendering on desktop Pin
Drew Stainton30-Dec-10 12:46
memberDrew Stainton30-Dec-10 12:46 
GeneralRe: OpenGL rendering on desktop Pin
Tcpip200531-Dec-10 17:51
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Questiontransparently blit a bitmap Pin
mike7521413-Dec-10 9:01
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AnswerRe: transparently blit a bitmap Pin
LunaticFringe13-Dec-10 12:00
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AnswerRe: transparently blit a bitmap Pin
jk chan27-Dec-10 1:00
memberjk chan27-Dec-10 1:00 
QuestionGraphics.FillPath( Brush, GraphicsPath ) does not fill a simple Path. Pin
WDI28-Oct-10 2:47
memberWDI28-Oct-10 2:47 
AnswerRe: Graphics.FillPath( Brush, GraphicsPath ) does not fill a simple Path. Pin
RaviRanjankr13-Dec-10 18:49
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Questiontool for real time graph plotting.. Pin
jainiraj27-Oct-10 1:21
memberjainiraj27-Oct-10 1:21 
AnswerCross Post! Pin
Henry Minute27-Oct-10 1:41
mvpHenry Minute27-Oct-10 1:41 
GeneralRe: Cross Post! Pin
jainiraj27-Oct-10 4:18
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