[SOLVED] Lightmap Gamma and Scale

[werner.poetzelberger]

I was testing the 'lightmap' feature for a standard material and experience this behavior:

 

It seems that the lightmap replaces the ambient light (from the scattering), at least the Gamma Value is turned to 1.
If turned to 0 then the ambient still works but the lightmap renders obsolete and flickering appears.

 

This seems to be strange behavior.

 

Images attached:

One image with a test lightmap, black and white spots. and single images as well (for better magnification)

 

Best.w.

[cryunreal]

Hi!

It is right, lightmap should contain environment light already.

Gamma slider it is lightmap = pow (lightmap, 1.0 - 2.2);

It is correct behavior.

[werner.poetzelberger]

I c. 

Could this come with an option to use environment?

 

So If I would use a lightmap in a way I want to do nightlights I would use the detail map rather than the light map.(?) But there is no add functionality.

 

Best.w.
 

[cryunreal]

Yes, lightmap for nightlights is good idea. We will try to add this functionality.)

[werner.poetzelberger]

Hi.

Did the lightmap in 2.0 alpha work in the same way? I guess it did.

 

We were using our own shader for our night lighting and it showed a very nice behavior.

 

In the end, we want to do the same thing, we have a 24h scene and during the night hours lights are turned on.

 

So if you have a scene which is at dusk/dawn, and the lights turn on, I dont want the whole lighting to change, but the lights to be added to the present shading.
Like you turn on a light, which illuminates the objects. So all values should added.

 

We used 16 bit / channel textures to avoid get banding.

 

By add i meant that for the detail material there are functions multiply, overlay but no add. If that makes sense.

 

pls see. image.

 

Cheers

[werner.poetzelberger]

We could 'abuse' the Emmision slot for that.

This is working as desired.

 

;)

[silent]

Hi Werner,

 

So the original issue is solved? :) 

[werner.poetzelberger]

Naja, lets say as CryUnreal mentioned that this is standard behavior, you can call it as solved.

 

In a sense it is not really solved, because I think, that a lightmap shouldnt exclude the ambient light. (or for our use it is not the best thing)-

But either we take the emmissive slot or we write an own shader.

 

merci.

werner

[silent]

Hi Werner,

Emission will have two options in 2.2 stable release: Luminosity (works like regular emission) and Illuminance (will lit the diffuse). Hope it will be enough :)

 

Thanks!

[paralyzah]

feature has been modified
now, lightmap can work in 2 modes:
1. without environment
2. with environment
this options is selectable in separate combo-box

[werner.poetzelberger]

Cheers!