invalid lightmap sample

[priad]

What does it means?

[vlado]

It means that some sample in the light cache has either a negative or invalid (like infinity etc) RGB component. This is similar to the "Material returned overbright or invalid color" warning that you may get.

Best regards,
Vlado

[priad]

thank's

[silver]

ok, but so what? what can we do to avoid it or we can go ahead without worry with those warnings? and i would like to know how to let a negative rgb value positive, because this is one of the most commons messages we get around

[vlado]

It depends on what is causing the error. If it is a texture map, turning on its Clamp option (in the Output rollout) might help. If it is a shader (e.g. the error occurs even without any textures), then changing the shader parameters may help.

Best regards,
Vlado