I don't know if this is helpful or not, but I was doing some screwing around with the DC version of this game on NullDC and discovered that the red-green polygons beneath the characters can be forced on and off using NullDC's settings.
Of course, in NullDC the shadows normally appear correctly for the DC version, but the entire blob can be rendered as a transparent black or made invisible using the settings under Settings->PowerVR. The blobs themselves referred to as 'modifier volumes' by NullDC.
Again, I don't know if this would assist at all in finding a way to isolate or disable them in Dolphin (I'm sure many would be okay with no shadows instead of those giant blobs following everyone around), but I figured since I have been watching this thread I would let you guys know about it.
Of course, in NullDC the shadows normally appear correctly for the DC version, but the entire blob can be rendered as a transparent black or made invisible using the settings under Settings->PowerVR. The blobs themselves referred to as 'modifier volumes' by NullDC.
Again, I don't know if this would assist at all in finding a way to isolate or disable them in Dolphin (I'm sure many would be okay with no shadows instead of those giant blobs following everyone around), but I figured since I have been watching this thread I would let you guys know about it.