[vtkusers] Rendering artifact at opacity<1

[marcin.krotkiewski]

Thanks a lot, Ken! This works much better. However ;) now I got very 
fat-looking fonts and lines (attached).

Anything suggestions what I can do with that?

Thanks!

Marcin



On 11/08/2017 02:29 PM, Ken Martin wrote:
> Try using depth peeling to resolve the transparency.
>
>
>   //@{
>   /**
>    * Turn on/off rendering of translucent material with depth peeling
>    * technique. The render window must have alpha bits (ie call
>    * SetAlphaBitPlanes(1)) and no multisample buffer (ie call
>    * SetMultiSamples(0) ) to support depth peeling.
>    * If UseDepthPeeling is on and the GPU supports it, depth peeling 
> is used
>    * for rendering translucent materials.
>    * If UseDepthPeeling is off, alpha blending is used.
>    * Initial value is off.
>    */
>   vtkSetMacro(UseDepthPeeling,int);
>   vtkGetMacro(UseDepthPeeling,int);
>   vtkBooleanMacro(UseDepthPeeling,int);
>   //@}
>
>
>
>
> On Wed, Nov 8, 2017 at 6:09 AM, marcin.krotkiewski 
> <marcin.krotkiewski at gmail.com <mailto:marcin.krotkiewski at gmail.com>> 
> wrote:
>
>     Dear developers,
>
>     I am observing strange rendering artifacts on my triangulated
>     surface when I use transparency. The artifacts are observed at
>     certain angles only. I've attached 3 pictures:
>
>      - opacity_1.png shows the model as it looks without transparency
>      - opacity_09.png shows the model at an angle chosen such that the
>     artifact on the surface is visible.
>      - opacity_0.9_behind.png shows the same model with transparency
>     rotated around to a view that does not show the artifact
>
>     I am using vtk 8.0 with the OpenGL 2 rendering backend.
>
>     Is this a bug, or am I doing sth wrong?
>
>     Thanks!
>
>     Marcin
>
>
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> Ken Martin PhD
> Distinguished Engineer
> Kitware Inc.
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