Hi Nabil,
Thank you Sebastian. So If i set the DrawArrays mode of the
PrimitiveSet, does it suffice?
Otherwise, is it easy to implement? Sorry but i'm newby in OSG.
Can you elaborate on this?
Usually you need to set the program-parameter for output:
GL_GEOMETRY_INPUT_TYPE and simply pass you geometry.
So when using triangles for instance, you need to pass 3 additional
vertices per triangle (the neighboring ones). You can get the
appropriate order from the openGL spec or various examples.
I'd start with a minimal example with a fixed vertex set to see what
needs to be set in the state and program.
The osggeometryshader example might help here to get started.
Cheers
Sebastian
On 21 July 2017 at 09:36, Sebastian Messerschmidt
<sebastian.messerschm...@gmx.de <mailto:sebastian.messerschm...@gmx.de>>
wrote:
Hi Nabil,
Hello,
I'm using geometry shader with OSG to do some operations on mesh
using GPU.
When i use /triangles_adjacency/ in the input layout, my shader
crashes.
I tried with /layout(triangles) in/ and it's running well.
Is there any configuration in OSG that i should use, or a
pre-processing on the mesh to understand triangle adjacency?
You need to pre-process the mesh to get the adjacency information.
There is no facility in OSG that I know of, wich does this for you.
Cheers
Sebastian
Regards,
Nabil
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