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Displacement with procedural fractals problem

Displacement with procedural fractals problem

2005-03-10       - By Axel Akesson

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Hello,

We have a problem here at the moment.
When using a 3D fractal or a 2D fractal in the rendertree as
displacement we see a grid structure in the displaced surface. The
fractal pattern is quite large (i.e no fine details).
When we render the fractal as a texture map and blur it in the FxTree
the problem dissapears. The grid structure is not visible when we view
the fractal as RGB.
We heard from a programmer friend that this might be a rounding error in
the fractal shader?

This problem occur when using Fine, Parametric and LDA displacement
methods. Also when we pre-subdivide (dividing) the mesh and set subd
level to very high the problem appears.

Any workaround/solution?

Cheers,
Axel
VR

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<p class=MsoNormal><span class=SpellE><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Hello</span></font></span><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>,<o:p></o:p>
</span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>We have a problem here at the
moment.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>When using a 3D fractal or a
2D fractal in the rendertree as displacement we see a grid structure in the
displaced surface. The fractal pattern is quite large (i.e no fine details).<o
:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>When we render the fractal as
a texture map and blur it in the FxTree the problem dissapears. The grid
structure is not visible when we view the fractal as RGB.<o:p></o:p></span><
/font></p>

<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>We heard from a programmer
friend that this might be a rounding error in the fractal shader?<o:p></o:p><
/span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'><o:p>&nbsp;</o:p></span><
/font></p>

<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>This problem occur when using
Fine, Parametric and LDA displacement methods. Also when we pre-subdivide
(dividing) the mesh and set subd level to very high the problem appears.<o:p><
/o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'><o:p>&nbsp;</o:p></span><
/font></p>

<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>Any workaround/solution?<o:p>
</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'><o:p>&nbsp;</o:p></span><
/font></p>

<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>Cheers,<o:p></o:p></span><
/font></p>

<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>Axel<o:p></o:p></span></font>
</p>

<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>VR<o:p></o:p></span></font><
/p>

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