question

Juraj T avatar image
Juraj T asked ·

Render points as normal facing disks

Hello, is it possible to render point cloud as disks oriented by normal attribute? Right now they seem to be always facing the camera, which results in incorrect speculars.

I tried to instance a circle on my point cloud, which produces expected results, but is impractically slow. I have around 80 milion of points.

render
10 |600 characters needed characters left characters exceeded

Up to 5 attachments (including images) can be used with a maximum of 2.0 MiB each and 9.8 MiB total.

Juraj T avatar image
Juraj T answered ·

So I finally figured it out.
The solution is quite simple: I can get normal attribute into shader with User Data RGB node and pipe it into Normal input in Standard Surface in Gometry group.

One catch is that I couldn't use N as an attribute name even though it existed on geometry, but I had to duplicate N into normal attribute and use that instead. Probably a bug? But easy to workaround.

10 |600 characters needed characters left characters exceeded

Up to 5 attachments (including images) can be used with a maximum of 2.0 MiB each and 9.8 MiB total.

Juraj T avatar image
Juraj T answered ·

This feature would be equal to Use N For Point Rendering, which is present in Mantra.

From docs:

Mantra will initialize the N global from the N attribute when rendering point primitives. When disabled (the default), point normals will be initialized to face the camera.
10 |600 characters needed characters left characters exceeded

Up to 5 attachments (including images) can be used with a maximum of 2.0 MiB each and 9.8 MiB total.

Write an Answer

Hint: Notify or tag a user in this post by typing @username.

Up to 5 attachments (including images) can be used with a maximum of 2.0 MiB each and 9.8 MiB total.

Welcome to the Arnold Answers community.

This is the place for Arnold renderer users everywhere to ask and answer rendering questions, and share knowledge about using Arnold, Arnold plugins, workflows and developing tools with Arnold.

If you are a new user to Arnold Answers, please first check out our FAQ and User Guide for more information.

When posting questions, please be sure to select the appropriate Space for your Arnold plugin and include the plugin version you are using.

Please include images, scene and log files whenever possible as this helps the community answer your questions.

Instructions for generating full verbosity log files are available for MtoA, MaxtoA, C4DtoA, HtoA, KtoA, and Kick.

If you are looking for Arnold Documentation and Support please visit the Arnold Support site.

To try Arnold please visit the Arnold Trial page.

Bottom No panel present for this section.