#bug in DOTS texture ????
29-Mar-92 17:21:51
Sb: #37445-#bug in DOTS texture ????
Fm: Charles Blaquiere 76046,1756
To: John Lemoine 75320,143
John,
I have a hunch as to what may be wrong. Disclaimer: everything in this
message is pure theory, based on my perception of how Imagine works! Bricks
are welcome.
The Dots texture is three-dimensional, basically a 3-D grid of spheres.
If a vertical plane passes through the exact center of the spheres, all the
dots will be the same size, the size specified in the texture parameter
screen.
Now say you move the plane towards you (i.e. perpendicular to its
surface). The plane still intersects the same spheres, but they'll all
appear smaller because they're "sliced" closer to their surface. If you
move the plane a bit more than the dots' radius, they'll seem to disappear.
At this point, increase the dot size in the texture. Presto, the dots
will reappear, because the plane now intersects part of the new, larger
dots. Of course, they'll be smaller, since a smaller part of the dot
intersects the plane, compared to the original placement, where the plane
intersected each dot through its center. Why, you may have to increase dot
size by as much as 3 to 1 to get the same result with the offset plane. :^)
Now realize that this translation could be the result of moving the plane,
or moving the texture axis. :^D
Of course, we all know Imagine 2.0 has a handy-dandy new default
placement for texture axes. B^D
Maybe there is a connetion here? I suggest you go back and make sure
your texture axes are where you think they are.
Blaq!