I've heard it said that SoM's Objects respond to light differently than map Pieces, so its hard to make secret doors etc, but I think the problem might be in the texture material's settings.
In Metasequoia's "Material Properties" there are some sliders:
Alpha = Sets how see-through the part is.
Diffuse= Sets how much light the part will reflect from lamps.
Emission= Sets how much light is "emitted" from the part (also makes item see-through in SoM)
Specular= unused in SoM
Power= Unused in SoM
Ambient = Unused in SoM (instead SoM uses the "Basic Lighting" setting in the Map Editor for this effect)
Metasequoia's default for Diffuse is 0.8 whereas SoM's map Pieces use 1.0 so if you don't change this in Meta, your Objects will reflect less light than SoM's. I made an example "hidden wall" Object to show the effect (I didn't bother aligning the texture perfectly on the Object- just an example).
In Metasequoia's "Material Properties" there are some sliders:
Alpha = Sets how see-through the part is.
Diffuse= Sets how much light the part will reflect from lamps.
Emission= Sets how much light is "emitted" from the part (also makes item see-through in SoM)
Specular= unused in SoM
Power= Unused in SoM
Ambient = Unused in SoM (instead SoM uses the "Basic Lighting" setting in the Map Editor for this effect)
Metasequoia's default for Diffuse is 0.8 whereas SoM's map Pieces use 1.0 so if you don't change this in Meta, your Objects will reflect less light than SoM's. I made an example "hidden wall" Object to show the effect (I didn't bother aligning the texture perfectly on the Object- just an example).