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SetObjectMaterial(objectid, 0, -1, "none", "none", 0xFFFFFFFF);
That will set the texture to the highest brightness supported by the object.
EDIT: Oh! You mean the mini-map shadow detector thing. Yeah, this is part of the CULL zone mess. This would even occur without objects in this location. It's not editable by SA-MP. Notice, the white arrow even changes to grey on your mini map, indicating a shadow cull zone. These zones specifically were used to "sneak" in GTA:SA.