[osg-users] Adapting a height field with a triangle/polygon?

[Raymond de Vries]

Hi everyone,

Thanks a lot for your suggestions. Based on your extra remarks, we will 
make up our minds and go on.

Cheers,
Raymond





On 6-9-2017 10:23, Robert Osfield wrote:
> Hi Raymond,
>
> There a number of ways of mixing polygonal data with height fields, 
> the best way will depend upon the requirements/constraints of your 
> application.
>
> If you need exactly intersections then converting the height fields 
> into a polygon mesh and then inserting the vertices and edges from the 
> mesh you want to add will be required. This will be slow so something 
> you'll likely want to do as a pre-processing stage.  The osgTDS code 
> that Don wrote many years back uses this approach.  I'm afraid I don't 
> have an insights into osgTDS or where to get it these days.
>
> If you don't need exact match then you could possible modify the 
> height fields values to match the polygonal mesh, you could do this on 
> the CPU as a pre-processing step, or render the polygonal mesh to a 
> depth texture and then use a vertex shader to read from two 
> depth/height field textures to render a single heightfield.
>
> Another approach would be to use a constructive solid modelling 
> approach, at least I have hunch you could do this somehow but would 
> need to think it through fully first.
>
> Given more time I'm sure I could come up with half a dozen more 
> approaches that may or may not work :-)
>
> Robert.
>
>
>
>
>
>
>
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