Hello Thomas,
Thomas Jam Pedersen wrote:
> After setting up the debug log I get the below output, when my code call
> FBOViewportPtr->render()
>
> -------------------- debug log content -------------
>
> WARNING: I need GL_EXT_framebuffer_object-Extension!
> INFO: Window::getFunction: function "glDrawRangeElementsEXT" is NULL!
> INFO: Window::getFunction: function "glTexImage3DEXT" is NULL!
> INFO: Window::getFunction: function "glTexSubImage3DEXT" is NULL!
> INFO: Window::getFunction: function "glCompressedTexImage1DARB" is NULL!
> INFO: Window::getFunction: function "glCompressedTexSubImage1DARB" is NULL!
> INFO: Window::getFunction: function "glCompressedTexImage2DARB" is NULL!
> INFO: Window::getFunction: function "glCompressedTexSubImage2DARB" is NULL!
> INFO: Window::getFunction: function "glCompressedTexImage3DARB" is NULL!
> INFO: Window::getFunction: function "glCompressedTexSubImage3DARB" is NULL!
> INFO: FBOViewport::render: (Re)Allocating image for read-back.
> INFO: Window::getFunction: function "glTexSubImage3DEXT" is NULL!
> INFO: Window::getFunction: function "glCompressedTexSubImage1DARB" is NULL!
> INFO: Window::getFunction: function "glCompressedTexSubImage2DARB" is NULL!
> INFO: Window::getFunction: function "glCompressedTexSubImage3DARB" is NULL!
> WARNING: Texture-Creation OpenGL Error: invalid enumerant!
> WARNING: Texture-Creation OpenGL Error: invalid enumerant!
> WARNING: Texture-Creation OpenGL Error: invalid enumerant!
> WARNING: Texture-Creation OpenGL Error: invalid enumerant!
> WARNING: Texture-Creation OpenGL Error: invalid enumerant!
> WARNING: Texture-Creation OpenGL Error: invalid enumerant!
> WARNING: Texture-Creation OpenGL Error: invalid enumerant!
> WARNING: Texture-Creation OpenGL Error: invalid enumerant!
> WARNING: Texture-Creation OpenGL Error: invalid enumerant!
> WARNING: Texture-Creation OpenGL Error: invalid enumerant!
> WARNING: Texture-Creation OpenGL Error: invalid enumerant!
> WARNING: Texture-Creation OpenGL Error: invalid enumerant!
>
> --------------------------------------------
>
> I summarize from the above that the graphics card on the Win2003 server does
> not support OpenGL.
> And thus my code fails.
yes, or maybe just a generic VGA driver instead of one that matches the
card ?
> But my application is a dll, which can generate a thumbnail image of a 3D
> model. I don't want to render it to any display, only render to file.
>
> My new question:
> Is it possible to setup OpenSG such that it can render a thumbnail of a 3D
> model, even on computers where no OpenGL drivers are installed.
no, sorry that is not possible. All rendering, whether to be shown in a
window or stored in a file goes through OpenGL. You can think of OpenSG
as a higher level interface to OpenGL, it does not have a (software)
rasterizer of its own.
Hope it helps,
Carsten
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