Jeroen Lapre'

syntheticperson

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Recent Forum Posts

Digital Elevation Displacement Artifacts June 23, 2018, 1:28 p.m.

It turns out there ARE artifacts in the DEM, I couldn't see them when viewed in an image viewer.
My workaround is to blur the texture in the displacement material: Texture/Filter Width 1->25

For anyone interested in DEM, here is a paper on minimizing scanning artifacts:
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.470.4960&rep=rep1&type=pdf [citeseerx.ist.psu.edu]

Digital Elevation Displacement Artifacts June 22, 2018, 1:19 a.m.

I'm trying to render a portion of the south pole of the moon, using DEM from the LRO mission.
I'm seeing horizontal banding in the renders.
When I look at the DEM, I'm not seeing any banding.
I suspect it's a displacement artifact.
I have tried all the geometry dicing settings, but they don't make any difference.
I also made sure the displacement bounds is larger than the displacement amount.
What am I missing?
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How to project curve onto surface & possible point number bug June 21, 2018, 5:30 p.m.

I'm trying to project a curve onto a distorted sphere.
I can't use the project SOP, because that requires the surface and projected curve to be nurbs.
I need both to be polygons for more flexibility downstream.
I'm trying to use a ray SOP, but it appears to require a surface to project onto another surface.
My work around is to take a copy of my curve, move it a small distance perpendicular to direction of projection, merge, then skin.

The possible bug I'm experiencing is that the displayed point numbers no longer reflect the actual point number, after the skin sop is applied.

Please refer to attached example.

Is there a way to project a polygonal curve onto a polygonal surface?
Is the point number display discrepancy, post skin sop, a bug?

Houdini version: 16.5.473
CentOS Linux release 7.3.1611

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thanks