#Field Render Design Flaw
02-Jun-95 12:57:34
Sb: #173201-#Field Render Design Flaw
Fm: Marion K. Marks 70700,2777
To: david W. mennenoh 71561,2343
David, read my message again. The "flickering pixel" is along the
edge of a BUMP MAP. Bump Mapping, especially in Release 3 and above,
utilizes floating-point mathematics to get those nice smooth rounded
edge shading effects. Note also that the View Log showed that EVERY
SINGLE FRAME out of over a HUNDRED FRAMES that was rendered on either
of TWO SEPARATE PENTIUM MACHINES here had those pixels set one way,
and EVERY SINGLE FRAME out of over a HUNDRED FRAMES that was rendered
on any of FOUR 486 MACHINES in the SAME EXACT JOB with the camera in
the SAME POSITION and the Bump Map UNCHANGED and the object UNMOVED
**ALL** had those pixels set another way. The ONLY DIFFERENCE
between those frames where those pixels were concerned was the state
of those pixels, and the CPU of the machines they were rendered on,
and it was a 100% ONE-TO-ONE CORRESPONDENCE. Now, you tell me. Does
that sound like it could be anything else BUT a Pentium FDIV roundoff
error?