Difference between revisions of "BlendLuxCore FAQ"
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= Frequently Asked Questions = | = Frequently Asked Questions = | ||
== Why is my area lamp black? == | === Why is my area lamp black? === | ||
See [[#"Why is my HDRI environment black and not showing up?"]] | See [[#"Why is my HDRI environment black and not showing up?"]] | ||
== Why is my HDRI environment black and not showing up? == | === Why is my HDRI environment black and not showing up? === | ||
You probably have other very bright light sources in the scene, for example a sun or a sky lamp. | You probably have other very bright light sources in the scene, for example a sun or a sky lamp. | ||
'''Solution:''' raise the gain value of the area or HDRI light source that is black. The gain value might need to be very high, e.g. 100000. | '''Solution:''' raise the gain value of the area or HDRI light source that is black. The gain value might need to be very high, e.g. 100000. | ||
== When I change the brightness of my lamp, nothing happens == | === When I change the brightness of my lamp, nothing happens === | ||
You are probably using an automatic tonemapper which adjusts itself to the changed brightness, making it seem like the brightness did not change. | You are probably using an automatic tonemapper which adjusts itself to the changed brightness, making it seem like the brightness did not change. | ||
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<!-- TODO describe how to switch to one, and/or add a link to the tonemapping settings page --> | <!-- TODO describe how to switch to one, and/or add a link to the tonemapping settings page --> | ||
== When I make one of my lights brighter, all the other lights get darker (or vice versa) == | === When I make one of my lights brighter, all the other lights get darker (or vice versa) === | ||
Similar to [[#"When I change the brightness of my lamp, nothing happens"]].<br> | Similar to [[#"When I change the brightness of my lamp, nothing happens"]].<br> | ||
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<!-- TODO describe how to switch to one, and/or add a link to the tonemapping settings page --> | <!-- TODO describe how to switch to one, and/or add a link to the tonemapping settings page --> | ||
== A material/object appears to be flickering when I move the camera and shows artifacts in final render == | === A material/object appears to be flickering when I move the camera and shows artifacts in final render === | ||
This effect is called [https://en.wikipedia.org/wiki/Z-fighting Z-fighting] and is usually caused by mesh faces being exactly on top of each other, e.g. two planes on the same world coordinates. | This effect is called [https://en.wikipedia.org/wiki/Z-fighting Z-fighting] and is usually caused by mesh faces being exactly on top of each other, e.g. two planes on the same world coordinates. | ||
Revision as of 10:51, 18 January 2018
Frequently Asked Questions
Why is my area lamp black?
See #"Why is my HDRI environment black and not showing up?"
Why is my HDRI environment black and not showing up?
You probably have other very bright light sources in the scene, for example a sun or a sky lamp.
Solution: raise the gain value of the area or HDRI light source that is black. The gain value might need to be very high, e.g. 100000.
When I change the brightness of my lamp, nothing happens
You are probably using an automatic tonemapper which adjusts itself to the changed brightness, making it seem like the brightness did not change.
Solution: Use a non-automatic tonemapper.
When I make one of my lights brighter, all the other lights get darker (or vice versa)
Similar to #"When I change the brightness of my lamp, nothing happens".
You are using an automatic tonemapper which tries to keep the image at the same brightness, making it seem like the brightness of the lamps changed.
Solution: Use a non-automatic tonemapper.
A material/object appears to be flickering when I move the camera and shows artifacts in final render
This effect is called Z-fighting and is usually caused by mesh faces being exactly on top of each other, e.g. two planes on the same world coordinates.
Solution:
- Check if there are two objects on top of each other, e.g. because you duplicated the object, cancelled the transform and forgot about it.
- Check if the mesh has duplicate faces. Enter edit mode and use the Remove Doubles button in the Tools panel, which might solve the problem in some cases.
Duplicate faces are often caused by extruding, cancelling the transform and forgetting about it.
Getting Help
If none of the above entries helped to solve your problem, consider asking in the user support forum or filing a bug report.