question

Andreas Glatz avatar image
Andreas Glatz asked ·

c4d background with shadow matte

hi,

i have to render some elements tracked into a film. i would like to have the 3d elements with al clean alpha channel containing the shadows. so i use a shadow matte material on the floor.

when i turn of the scene´s background object i loose the lighting of the background image and end up with much too dark shadows from the floor. when i leave the background turned on i did not find a way to get rid of it in the alpha channel. is there a way i can have the background contributing to the lighting of the scene but not to the alpha channel?

thank you much!

withbg.jpgwithoutbg.jpg


shadow matte
withbg.jpg (129.2 KiB)
withoutbg.jpg (83.8 KiB)
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.

1 Answer

· Write an Answer
Andreas Glatz avatar image
Andreas Glatz answered ·

sorry, i already found the perfect answer in this thread:

https://answers.arnoldrenderer.com/questions/10383/background-shadow-matte.html


i only haven´t understood the solution correctly with multiplying the alpha.

thanks anyway

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.