On 1/3/2012 11:43 PM, J.P. Delport wrote:
Hi,
On 03/01/2012 23:39, wang shuiying wrote:
As can be seen from the source code, I attach an image to the camera, and
access data from the image,
I am rendering to an FBO.
I don't think you are rendering to an FBO with the above code.
I have to
Hi, J.P.
I am really confused now. I just want to get pre-rendering information
from a camera through an image, which is attached to the camera. But I
don't want to draw the image onto a texture. The rendering process goes
through programmable shader and I need to write four different
Hi,
To J.P. and Paul:
Thank you both very much !
After I change the renderTargetImplementation from FRAME_BUFFER to
FRAME_BUFFER_OBJECT , it works! That is, I can get the fourth element of
gl_FragColor modified in Fragment Shader though image. Plus, the camera
in question is a pre-render
Hello,
In my programme, the fourth element of gl_FragColor is changed by
fragment shader to be a random number between 0 and 1. But when I access
this element by the corresponding image, the element is always 1. I got
to know that in the rendering pipeline after fragment operation, there
Hi,
On 03/01/2012 15:55, wang shuiying wrote:
Hello,
In my programme, the fourth element of gl_FragColor is changed by
fragment shader to be a random number between 0 and 1. But when I access
this element by the corresponding image, the element is always 1.
What image are you talking about
If you are trying to read the alpha value from a framebuffer that has only RGB,
then you will always read 1.0 for alpha, per OpenGL spec.
-Paul
On 1/3/2012 6:55 AM, wang shuiying wrote:
Hello,
In my programme, the fourth element of gl_FragColor is changed by fragment
shader to be a
Hello,
(1)to J.P.
the related source code is as following:
// camera and image setup
osg::Camera::RenderTargetImplementation renderTargetImplementation;
renderTargetImplementation = osg::CameraNode::FRAME_BUFFER;
osg::Program * program = new osg::Program();
Hello,
Sorry, the third line of 'access data' part should be :
float color_a= color[3];
Shuiying
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Hi,
On 03/01/2012 23:39, wang shuiying wrote:
Hello,
(1)to J.P.
the related source code is as following:
// camera and image setup
osg::Camera::RenderTargetImplementation renderTargetImplementation;
renderTargetImplementation = osg::CameraNode::FRAME_BUFFER;
^ If you want FBO, you probably
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