question

Francisco Cunha avatar image
Francisco Cunha asked ·

Getting photometric Lights to emit in positive Z direction

Hello,
I'm having a problem with photometric lights. The problem is that the light only emits on positive Z axis, and everything is black on the negative Z axis like there is a plane blocking the light. Well, this is not what happens in the real world, some lights spread in both directions and I'm using a ies file that spreads in both directions (it works in Vray). Anyway, the real world light spreads all over regardless it is a spot or an omni. Is there some parameter I'm not aware, or not using?

Thank you

light
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.

Stephen Blair avatar image
Stephen Blair answered ·

Can you post one of these IES files?

Share
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.

Shawn Kearney avatar image
Shawn Kearney answered ·

Are you sure this isnt your ies file? A lot of times they do behave this way in order to model the fixture. I think Phillips and Sylvania has some bare bulb models.

1 comment Share
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.

I've tried different ies files, including philips and ones that are supposed to simulate wall fixtures that spread light upwards and downwards. Still there is no light bleeding above the light position, it realy looks like a plane is blocking the light as the picture attatched. Please notice the horizontal line, it is coincident with the top coordinate of the light.

0 Likes 0 · ·
2-801.png (406.5 KiB)

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.