Transfering surface information in between two meshes

grayOlorin

Hi, wanted to see if someone in this forum could point me in the right direction:

How do you do map transfer/generation in between two meshes in Houdini? some examples of what I am looking for:

- Create a tangent space normal map from a hi res mesh (without UVs) to a low res mesh

- Transfer the color map from a scan model to a low res model without transfering UVs (by doing ray intersections in 3D space)

What I am looking for is similar to the transfer maps utility in maya or the ultimapper in XSI (however, I am looking for basically the results, even if the process is completely different) . I looked into the help, through several forums, etc. but could not find anything in regards to this.

Thank you in advance Smile

john_z · Talkative Joined: 08 Jun 2009 Posts: 45

Hi,

an option could be to use the AttribTransfer SOP, it works by proximity
so you don't need UVs.

brianBurke

creating a shader that raytraces up and down the normal of your low res mesh with the tracing scoped only to the hi-res mesh is the way to go. you can then use mantra -u to save the results as a texture. too busy to make an example right now, but maybe later in the day i can post a file.

i do this a lot (mostly with scan data) and mantra does a great job at it.

-b

brianBurke · Posted: Fri Apr 29, 2011 12:22 pm GMT Post subject:

found an old setup to get the maps off of a scan, swapped in some simple geometry for sharing:

good luck dude

grayOlorin · Posted: Fri Apr 29, 2011 3:52 pm GMT Post subject:

Wow man! Thank you for this example! This is what I was looking for Smile

Love the fact that you can basically bake whatever you can trace...! This is great stuff

Thank you all for your replies!

oldiesgoodies · Lurker Joined: 04 Jan 2010 Posts: 20

Hi

The sample by brian is giving me error

"mantra: UV rendering unsupported with ray tracing." I tried other engines as well and does not seem to change the result.

grayOlorin · Posted: Sat Oct 29, 2011 12:12 pm GMT Post subject:

Hi are you rendering inside if render view, mplay, or to an image? I have found that rendering to uvs does not play well with render view

Also, are your render engines using micropolygon?