I can't render a black image

Rendering
1

Hi @nathanletwory,
I’m having another issue: I can’t get a fully dark image.
I was used to a trick in V7 were I could put a very dimmed light to get a really dark image.
I do this when I don’t want to have any environment affecting the image.
With the latest version 8 I’m always getting an annoyng back light from an EnvMap … not set by me!!

This are the Env settings of the scene

20240124_LightOptions
20240124_LightOptions1920×1080 313 KB

and this what I get with the dimmed light trick.

20240124_EnviromentBUG
20240124_EnviromentBUG1920×1080 270 KB

Note:

  1. the image has an Envmap lighting from the back
  2. my selected light (the only active) is in the front part.

The file is here: Your best Rhino Rendering mini challenge - #13 by skysurfer

2

I can get black here if you go lower on the environment intensity setting…

try .001

I’m using ,005 here.

image
image1370×751 17.6 KB

same image at .008

image
image1244×689 17.7 KB

1 Like
3

I see but isn’t working if I switch ALL the environment map off.
When all the Envmap are off a default one appears no matter if I have light or not.
Is this an intended behaviour?

4

If you still have skylight checked then yes, because you have your environment set to black color.

Turn off the skylight as well and you’ll get a default camera-based light (over left shoulder).

1 Like
5

ah… yes… you have to actually have the environment lighting enabled but at a tiny amount, or rhino throws a default light set up into the scene.

If you don’t have environment lighting or skylight, or any physical lights in the scene it’d be black… so rhino throws a default directional light into the scene.

6

By the way, in latest Rhino 8 if you have an object with an emissive material in a scene without any lights the default light won’t be enabled anymore. The object with that material now functions as the light source.

1 Like
7

This is with upcoming Rhino 8.5, not sure if this is already in Rhino 8.4