After little thinking I start think that this is RTPS/RTPT packet for GTE
First Rotation matrix, next are translation vector and last are View plane distance.
--------------------------------------------------------------------------
RTPS 15 Perspective transformation
Fields: none
Opcode: cop2 $0180001
In: V0 Vector to transform. [1,15,0]
R Rotation matrix [1,3,12]
TR Translation vector [1,31,0]
H View plane distance [0,16,0]
DQA Depth que interpolation values. [1,7,8]
DQB [1,7,8]
OFX Screen offset values. [1,15,16]
OFY [1,15,16]
Out: SXY fifo Screen XY coordinates.(short) [1,15,0]
SZ fifo Screen Z coordinate.(short) [0,16,0]
IR0 Interpolation value for depth queing. [1,3,12]
IR1 Screen X (short) [1,15,0]
IR2 Screen Y (short) [1,15,0]
IR3 Screen Z (short) [1,15,0]
MAC1 Screen X (long) [1,31,0]
MAC2 Screen Y (long) [1,31,0]
MAC3 Screen Z (long) [1,31,0]