How could I transfer colors from material to points?

[Masoud]

Hi;

Is it possible to transfer colors from geometry's material to points?

I found this thread:
https://www.sidefx.com/forum/topic/12562/
 

But I want to get texture from any input geometry, procedurally.

 

Thanks.

[ikoon]

Hi Masoud, isn’t Attribute from Map SOP what you need?

https://www.sidefx.com/docs/houdini/nodes/sop/attribfrommap.html

[Masoud]

13 hours ago, ikoon said:

Hi Masoud, isn’t Attribute from Map SOP what you need?

https://www.sidefx.com/docs/houdini/nodes/sop/attribfrommap.html

Hi;

AttributeFromMap, creates a point attribute from the color information found in an image (file), but I need to extract colors from texture used in a material, automatically.

Actually, I need this in a digital asset.

 

Thanks.

 

[Librarian]

Quote

But I want to get texture from any input geometry, procedurally.

 @Masoud Please post reference

here you have some Nice approach ...if ?

https://www.sidefx.com/forum/topic/5905/?page=1#post-27566

Edited June 8, 2019 by srletak

[Masoud]

I can't find any useful things. some links in that page are broken.

[Librarian]

@Masoud what effect do you want to achieve.... Please post reference 

[Masoud]

I want to use it as a part of my digital asset, so by connecting a geometry to input of my asset, it first converts input geometry to points using ADD SOP, then it needs to fetch and transfers colors from material to points. (Later I will use these colored points to make something else...)

 

[Librarian]

On 2017-05-12 at 12:05 PM, konstantin magnus said:

Usually I would just copy-paste the nodes from a material network and reconnect their global inputs and outputs.

As shaders work on pixels and not on points I don't think there is a direct way of exporting its calculations to points, but you could try baking out pixel maps and then import them with attribfrommap.

@Masoud most important thing that i need.... you choose to left behind hm .......

Quote

(Later I will use these colored points to make something else...)

 

 

here is 6 ...and read please (pixels , values and other stuffs )

explore

6met.hipnc

have a nice Day

 

[Masoud]

Hi "srletak";

At first I want to thank you for the file. It's very helpful.

The problem is  I don't want to use a picture file to extract color information (like AttributeFromMap SOP, Pic(), VOP SOP color map, tex() and so on).

I think when a geometry has a material (and a diffuse texture), we should be able to read the color information from it, right? 

I find a Mantra attribute that seems it can pass diffuse information to point : " vm_surface ", but I don't know how to use it..

Edited June 9, 2019 by Masoud

[zarti]

On 6/9/2019 at 1:59 PM, Masoud said:

Hi "srletak";

At first I want to thank you for the file. It's very helpful.

The problem is  I don't want to use a picture file to extract color information (like AttributeFromMap SOP, Pic(), VOP SOP color map, tex() and so on).

I think when a geometry has a material (and a diffuse texture), we should be able to read the color information from it, right? 

I find a Mantra attribute that seems it can pass diffuse information to point : " vm_surface ", but I don't know how to use it..

hi Masoud ,

away from my workstation , but maybe this mixed technique could work ; bake wahtever info from your material into a texture map and then simply read those attributes with a truly_simple_and_pretty_editable AttribFromMap . as bonus points you can edit the bakedTexure with COP context and have a_lot_more control without going to rerender . dont know if this will do the work for your case , but just a suggestion ..

 

.cheers