Hi tracers!

After doing some other things for a while, I returned to my great
POVghanistan project, beginning to play around with Mark-Hendrik
Bremer's suggestions for mud brick wall isosurfaces...

But when I tried to use conventional CSG to cut a door and windows in
the main building block (the subtracted objects being isosurfaces
themselves), I got those strange results you see in the first picture.
Obviously, the rounded_box part of the house's back wall has
disappeared, while the irregular_bricks part still remains... bizarre!

Then I tried simulated CSG within the isosurface function:

isosurface
{
  function { max(f_rounded_box( x, y-YDispl(x,y,z), z, 0.05, 5, 1.5,
2.5)-Brick_Fun_New(x, y/3, z)*0.3,
  -f_rounded_box( x, y-YDispl(x,y,z), z+2.35, 0.05, 0.5, 1,
0.25)-Brick_Fun_New(x, y/3, z+2.35)*0.3) }

  contained_by { box {-50, 50} }
   max_gradient 5
  translate <0, 1.4, 0>
   texture { Afghan_Classic_Mud }
  }

but then now subtractions at all show up (2nd image; for convenience, I
left out the inner hollow of the building and just tried to cut a door
from the front side). The main body is 10 by 3 by 5 meters, the door
subtraction body is 1 by 2 by 0.5 meters and
translated -2.35 meters along the z axis. I asked myself how to
implement that "+2.35" when using a multi-partite function like in this
example... only in the rounded_box part or also in the YDispl and
Brick_Fun_New parts?

See you in Khyberspace!

Yadgar

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