Basically, I want the texture to slide along the curve ( breaking or rotating... 

Any suggestions would be appreciated.

Offset along Curve.hip

I'm trying to create an obsidian texture in COP using Fractal noise node that problem I'm facing is this node does not have an id output so I tried 
segment by value node but i didn't get the results i needed, I'm trying to get every chunk generated have its own textures values and orientations.
If there is a way to achieve this effect using Worley noise I'll be glad to use that node since it has it's own id output

Any idea or guidance will be much appreciated

Thank you

In the context of a COP network, is it possible to remove specific shapes by selecting their IDs?

Thanks for helping.

I've created a COP network within a Geometry context, and added a "Preview-Material" node.

I connected the output of a Fractal-Noise node to the "Height" input of the "Preview-Material".

The resulting mesh is displayed, but I'm wondering: how can I convert this mesh into a polygon?

Thanks for helping. 

In COP, when I add a "Worley_Noise" node, most of the generated shapes appear to be the same size.

Is there a way to adjust the size of some of them to be larger?

Thanks for helping.

I am building some HDAs that are used for certain texture correction, grading and cleanup operations.

I love new COPs and its amazing features, however unfortunately for now there are a lot of missing tools, that I know from old COPs, such as Color Correction and LUTs (Lookup) tools. 

Hence I decided to use a mix of old and new COPs in my HDA - however currently I struggle to dynamically reference output from old COPs into new COPs and vice versa. 

A quick example would be:

1. Import image file into old COPs, apply LUT via Lookup node, add _OUT_LUT null.

2. Reference the output from old COPs (_OUT_LUT) into a new COP and perform further operations for example to procedurally create texture maps for PBR material.

Is there anyone who managed to do so? I can't find a way to bring output from "old COPs" into the new one, other that exporting the image sequence and then bringing it into new COPs which is not ideal solution for me.

Many thanks!
Adrianna

Here’s the link to the job post for reference:
https://www.upwork.com/jobs/~021860346067867494341
 

Any thoughts or suggestions on the best approach would be greatly appreciated.

Thanks!

I do see a difference when I look at the depth AOV. From C4d the image is red, the depth AOV from Houdini turns black/white. I don't know if it could be in there. Attached the exr out of Houdini.

Anyone have a solution?

dof.arnold1.0001.exr

I have scene with emissive volume and no density rendered in Karma which is being comped over footage. Issue: since its emissive transparent pixels I was unable to replicate the exact look in AE. Currently ignoring the transparency and using screen blend mode. I have read about straight and premul alpha, but couldnt implement these findings.

I know its impossible to have volumes emit light, while not blocking any light, but it would save a ton of time to render without density.

Anyone stumbled upon this and found elegant simple solution?

Essentially I want to have at least some sort of see through edges and full opaque volume inside dense areas.

Thank you very much for any help, I might want something impossible, but that's where creativity comes :D
 

Based on this job posting it looks like SideFX has some big plans for COPs that look pretty exciting.

https://sidefx.bamboohr.com/careers/90

I have a COPnet I'm reading a sequence of EXR images into for processing.  It reads in with a File COP using the filepath with filename and $F.exr as the extension.  Frames 1-6 read without issue, then starting at frame 7 the File COP no longer reads images if $F is replaced manually with 7 or any frame that follows, but frames 1-6 still read in correctly either with $F or manually using the frame number.

The EXRs are valid, were all rendered at the same time, and can all be read through MPlay, the issue only occurs in COPs as described.  I will also note I have been using COPnets for image processing in multiple scenes for months and this is the first time this problem has occurred; I'm using Houdini 19.5.493 on Windows 10

Things I have tried that have not resolved the issue:
- Verified the timeline settings were on Integer frames, i.e. no subframe increments
- Re-creating the COPnet from scratch both in the same scene as well as a completely new scene following a reboot.
- Creating a frame attribute on a null node to reference in the filename; this works as long as I manually set the frame number, but using $F for that attribute once again fails
- Re-rendering the EXRs
- Converting the EXRs to PNGs

At this point I'm stumped.  It doesn't appear to be a corrupt scene, or corrupt images, and I have never had issues with $F use previously, so there must be something I'm missing.

Has anyone come across this or something similiar with $F no longer working for partial ranges?
 

i am new here. I have searched for a solution to this problem, but cant find one. I want to transfer a point-attribute from a polysurface with uvs into COPS. Just like it works with heightfields and the "Sop Import"-node.

I read that the qLib "uvPointCloud ql" would be the solution for this, but the node does not work for me. There is a warning that the "ray_ql1"-node inside is using an incomplete asset definition?

UPDATE: Solved the issue with the "ray_ql1" node by importing the asset manually from the qLib-folder, but still could not get it to work unfortunately.

Also found out that i could convert the polySurface into a volume and then get the colors from there into cops with "Sop Import"-node i guess, but not sure how to go about making the volume with the inherited color-attribute?

thanks,

Marcus

I am trying to remap the colors from a noise node in a COP2 network.

What I would like to do is replacing the current colors of the noise with 4-5 colors that I have defined myself.

I can't find a way to remap the colors individual.

I was hoping I could get some help. I just want to overlay one image over another.
But the "Over" composite method changes colors.

How can I retain these and just layer them unto one layer?

I have gone through the forum and I could not find a solution to this problem, so please forgive me if it exists.
The sad part is I totally figured this out months ago through trial and error and never saved the file somewhere that I could revisit it apparently ( silly me ! ).

So I have made some flat tapered grids that represent disco lights ( light cones but flat ) and have coloured and animated them rotating with sin() and added a camera.
Because this is for a 2D style project, there is no shading or lights required. The shader is literally just the Cd attribute plugged into emission with random colours per prim.

What I would like to do is use COPS to render my scene as it's way faster to do this for something that has no real lighting.

I just cannot figure out how to get :
1) the same view as the camera, but in cops
2) the colour information to show up.

It's always cops that trips me up. lol. Any help is greatly appreciated.

How can we warp the UV's (by warping a Deform Plane to use in the Deform COP) with points,

to have more control over where it goes? (as opposed to using noises) Like puppet-warp, grid-warp, in 2D apps,

Thanks for any help,

On a grid, I used a VOPSOP with a point cloud lookup to find the closes point around my current point that has a specific attribute. And then I can measure the distance between them and compute other stuff.

But, this system is slow (We have a big pipeline with many different things, this is just part of it). We decided to swtich to COP since we can treat the grid as an image. 1 point == 1 pixel.

What I want to know, can I use the point cloud nodes in a VOPCOP2FILTER inside a COP2NET?

Pixel position is the same as point position right? But how do I specify the Point Cloud Texture (file) to be the COP image? Is it posible at all to use Point Cloud nodes in COP context?

Thx for your input.

C