Clipping using SV_CLIPDISTANCE
#1
Hi,
I am a very beginner with DXEngine (currently working with the trial version). In the past I have developed a WPF 3D application with big models (BIM models), and I face severe performance problems, especially when clipping the model (so far I implemented only clipping on a Z level in world space).
Now I have implemented my first shaders using DXEngine, and the performance is quite impressive. But I have a special issue with clipping (setting SV_CLIPDISTANCE in the vertex shader).

My simple trial model is a cube of 8000 spheres (20x20x20), each modeled as a WPF ModelVisual3D. 
This is my model rendered in DXEngine using no effect (I assume a "default standard effect" is used):

   


Looks fine!

When I render it with my own shaders (which only change the colour), it looks like this:

   

This looks also fine and works very fast.

But when I clip the model (done also in my shader), it looks like this:

   

Clipping is basically correctly done. But the upper part (which should be clipped, i.e. invisible) seems to be rendered with the default standard effect.

For this sample I set the color of the WPFMaterial to completely opaque:
new DiffuseMaterial(new SolidColorBrush(Colors.Blue))
or
new DiffuseMaterial(new SolidColorBrush(Color.FromScRgb(1.0f, 0, 0, 1)))

But when I set the alpha value to a little bit lower than 1.0:
new DiffuseMaterial(new SolidColorBrush(Color.FromScRgb(0.99f, 0, 0, 1)))

clipping behaves now as expected:

   

What is the reason for this behaviour?
  


Messages In This Thread
Clipping using SV_CLIPDISTANCE - by TrialUser - 07-03-2020, 11:33 AM
RE: Clipping using SV_CLIPDISTANCE - by abenedik - 07-04-2020, 10:37 AM
RE: Clipping using SV_CLIPDISTANCE - by TrialUser - 08-12-2020, 01:16 PM

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