How to create rounded edge shader?

[magneto]

Hi,

 

modo has this shader called rounded edge shader. Anyone knows if this can be done in Houdini?

 

 

I saw one example online but it was measuring angle between polygons in SOPs and reading back in the shader but it wasn't working for any shape but cubes.

 

 

Thanks

[Mzigaib]

I believe you can find something very similar here:

 

http://www.houdinitools.com/

 

Look for Micro Bevel VOP

 

I hope that helps.

[magneto]

Thanks Michel, that's in the right direction. But the bevel seems faceted for relatively large bevel width:

 

 

I assume he didn't use high detail to render faster. Any idea on how to modify it to make it produce much rounded bevel?

 

Still very impressed

[Guest tar]

It's kind of built in: use a CreseSOP set to 5 or 10 and check Render Polygons As Subdiviosn (Mantra) at the Scene level.

 

 

SubDCreaseed.hip

[magneto]

Thanks Marty, it seems useful. But it doesn't handle intersected geometry like in modo, or also NURBS or if the polygons are disconnected. Though being able to adjust the "bevel width" is useful.

 

Edited March 16, 2015 by magneto

[ayidi]

 

http://eoyilmaz.blogspot.com/2010/09/round-corners-in-houdini.html

 

It includes an example hip file with a shader but you would have to modify it to include PBR (add a surface model)

Edited March 16, 2015 by ayidi

[ayidi]

Imagine this in Houdini:

 

[stevegh]

http://forums.odforce.net/topic/5472-micro-bevels/?p=112090

[magneto]

Imagine this in Houdini:

 

 

Are they using volumes? It would be nice if it showed the actual geometry's tessellation. The wireframe overlay it shows belongs to the original models, but not the final tessellated model. Otherwise it would be a genius boolean method.

 

http://forums.odforce.net/topic/5472-micro-bevels/?p=112090

 

Thanks, I just checked it, it seems another cool way. I am getting some artifacts though:

 

[ayidi]

Are they using volumes? It would be nice if it showed the actual geometry's tessellation. The wireframe overlay it shows belongs to the original models, but not the final tessellated model. Otherwise it would be a genius boolean method.

 

I believe it's implemented through implicit surfaces. Here's a better overview of the workflow with examples here: http://www.braid.com/fusion/help/tips/index.html

 

I can't wait to get my hands on meshfusion.

 

Don't expect to get good results with shaders, might be easier to just create the bevels yourself.

[magneto]

 

http://eoyilmaz.blogspot.com/2010/09/round-corners-in-houdini.html

 

It includes an example hip file with a shader but you would have to modify it to include PBR (add a surface model)

 

So far this seems to be the best.

[Guest tar]

The Modo one just appears to be just blurring the normals. Was testing this Nuke.

[Netvudu]

Interesting! So it should be doable even from SOPs?

[magneto]

Nice trick Marty. How can you blur normals in a shader though? I thought they were ust faking normals similar to bump maps but that was it. It also only seems to work for small width. Here is the blender version:

 

 

http://blender.stackexchange.com/questions/20997/shader-rounded-edge-between-the-two-intersecting-faces

[Gordon]

You could implement a gather() loop and use that to retrieve the normals of the nearby surfaces, then use that to adjust N.

 

If you keep the maxdist as short as possible, it might not be horrifically slow, maybe....