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Hi, all !
While playing with meshes I've encountered strange behavior of spheres,
positioned at mesh vertices - after changing the scale they move from
previous location (see images). Looks like the scale
operation applied to a whole array of spheres, produced by loop, but the
scale operator is inside the sphere object. I expected they would stay
in place and only change the size.
What I'm missing ? Any suggestions please ...
--
YB
// ------------------------------------------------------------------
#version 3.8;
global_settings { assumed_gamma 1 }
camera {
perspective
angle 25
location <20,15,20> * 0.2
look_at <0.5,0.5,0>
right x * image_width / image_height
}
light_source{<-500,0,0> rgb 1} light_source{<500,0,0> rgb 1}
light_source{<0,0,-500> rgb 1} light_source{<0,0,500> rgb 1}
light_source{<20,15,20> rgb 0.4}
#declare VertexVectors= array[24] {
<0,0,0>, <0.5,0,0>, <0.5,0.5,0>, //1
<0.5,0,0>, <1,0,0>, <0.5,0.5,0>, //2
<1,0,0>, <1,0.5,0>, <0.5,0.5,0>, //3
<1,0.5,0>, <1,1,0>, <0.5,0.5,0>, //4
<1,1,0>, <0.5,1,0>, <0.5,0.5,0>, //5
<0.5,1,0>, <0,1,0>, <0.5,0.5,0>, //6
<0,1,0>, <0,0.5,0>, <0.5,0.5,0>, //7
<0,0.5,0>, <0,0,0>, <0.5,0.5,0> //8
}
// Mesh
mesh2 {
#local len = dimension_size(VertexVectors,1);
vertex_vectors {
len,
#for (i, 0, len-1)
VertexVectors[i]
#end
}
face_indices {
8,
<0,1,2>, <3,4,5>, //1 2
<6,7,8>, <9,10,11>, //3 4
<12,13,14>, <15,16,17>, //5 6
<18,19,20>, <21,22,23> //7 8
}
pigment {rgb 1}
}
// Spheres
#local len = dimension_size(VertexVectors,1) - 1;
#for (i, 0, len)
sphere { VertexVectors[i], 0.04
texture { pigment {rgb <0.1, 0.3, 0.1>} }
scale y * 1.2 // Why they moves ?
}
#end
// ------------------------------------------------------------------
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Attachments:
Download 'test_scale_no.png' (12 KB)
Download 'test_scale_yes.png' (12 KB)
Preview of image 'test_scale_no.png'
Preview of image 'test_scale_yes.png'
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