5,389
edits
OBD:PLEA: Difference between revisions
m
oops
(filling in after reading up on BNVs) |
m (oops) |
||
| Line 38: | Line 38: | ||
:*If the high bit is not set, then the 4 values (a, b, c, d) are used as described above.<br />(If referencing the above example without a high bit, then any points with z > - 612 will be in front of the plane, whereas points with z < -612 will be behind the plane.) | :*If the high bit is not set, then the 4 values (a, b, c, d) are used as described above.<br />(If referencing the above example without a high bit, then any points with z > - 612 will be in front of the plane, whereas points with z < -612 will be behind the plane.) | ||
:*If the high bit is set, then the plane equation coefficients become (-a, -b, -c, -d).<br />(If referencing the above example with a high bit, then any point with z > - 612 will be behind the plane, whereas points with z < -612 will be in front of the plane.) | :*If the high bit is set, then the plane equation coefficients become (-a, -b, -c, -d).<br />(If referencing the above example with a high bit, then any point with z > - 612 will be behind the plane, whereas points with z < -612 will be in front of the plane.) | ||
:This means that the actual array index is a 31-bit value (i.e., there can only be up to | :This means that the actual array index is a 31-bit value (i.e., there can "only" be up to 2,147,483,648 distinct planes in a level), but the same array element can be used for two different facing directions. | ||