Post by jdunlap on Jan 25, 2021 5:13:22 GMT
Hello all!
So, I have been trying to recreate the scene with the dice at the end of Chapter 16. I haven't found a YAML for it on the forums, so I was making my own. What I have been doing is this:
1) Start with a cube.
2) Subtract out a cylinder along each edge.
3) Add a (short) cylinder along each edge. (2 and 3 change the sharp corner to a curve)
4) Add a sphere at each vertex to smooth the corners
5) Subtract out a bunch of spheres for the pips.
I combine each step with a CSG (although I actually do 3 and 4 as one group and then do a CSG.) However, my final product is not correct:
My cube with the smooth edges looks fine (the material is edited later):
If I change the difference to a union, it all works great except the pips stick out!
So, I think it is clear that my CSG works (and passes all tests), but I think there is an issue with determining hits when using nested CSGs. Perhaps the IntersectionAllowed is the problem? If so, I can't seem to figure out where. Does anyone have any advice?
Here is my YAML file in case anyone wants to take a look. (Sorry, I had to guess at the CSG format as I have seen no files that use it.)
So, I have been trying to recreate the scene with the dice at the end of Chapter 16. I haven't found a YAML for it on the forums, so I was making my own. What I have been doing is this:
1) Start with a cube.
2) Subtract out a cylinder along each edge.
3) Add a (short) cylinder along each edge. (2 and 3 change the sharp corner to a curve)
4) Add a sphere at each vertex to smooth the corners
5) Subtract out a bunch of spheres for the pips.
I combine each step with a CSG (although I actually do 3 and 4 as one group and then do a CSG.) However, my final product is not correct:
My cube with the smooth edges looks fine (the material is edited later):
If I change the difference to a union, it all works great except the pips stick out!
So, I think it is clear that my CSG works (and passes all tests), but I think there is an issue with determining hits when using nested CSGs. Perhaps the IntersectionAllowed is the problem? If so, I can't seem to figure out where. Does anyone have any advice?
Here is my YAML file in case anyone wants to take a look. (Sorry, I had to guess at the CSG format as I have seen no files that use it.)
# ======================================================
#
# dice.yml
#
# This scene demonstrates the CSG operations of the renderer
#
# ======================================================
# ======================================================
# the camera
# ======================================================
- add: camera
width: 400
height: 400
field-of-view: 1.047
from: [3, 3, -3]
to: [0, 1, 0]
up: [0, 1, 0]
# ======================================================
# the light
# ======================================================
- add: light
at: [5, 5, -5]
intensity: [1, 1, 1]
# ======================================================
# defininitions
# ======================================================
- define: red
value:
ambient: 0.2
diffuse: .75
specular: .8
reflective: 0
color: [ 0.7, 0.1, 0.1]
- define: die-cube
value:
add: cube
transform:
- [translate, 0, 1, 0]
material:
ambient: 0.2
diffuse: .75
specular: .8
reflective: .1
color: [ 0.7, 0.1, 0.1]
- define: pip
value:
add: sphere
transform:
- [scale, 0.18, 0.18, 0.18]
- [translate, 0, 1, 0]
#1 on front face
- define: pip1
value:
add: pip
transform:
- [translate, 0, 0, -1]
#2 on bottom face
- define: pip2
value:
add: group
children:
- add: pip
transform:
- [translate, -.5, -1, -.5]
- add: pip
transform:
- [translate, .5, -1, .5]
#3 on right face
- define: pip3
value:
add: group
children:
- add: pip
transform:
- [translate, 1, 0, 0]
- add: pip
transform:
- [translate, 1, 0.5, -0.5]
- add: pip
transform:
- [translate, 1, -0.5, 0.5]
#4 on left face
- define: pip4
value:
add: group
children:
- add: pip
transform:
- [translate, -1, -0.5, -.5]
- add: pip
transform:
- [translate, -1, .5, .5]
- add: pip
transform:
- [translate, -1, -.5, .5]
- add: pip
transform:
- [translate, -1, .5, -.5]
#5 on top face
- define: pip5
value:
add: group
children:
- add: pip
transform:
- [translate, -.5, 1, -.5]
- add: pip
transform:
- [translate, .5, 1, .5]
- add: pip
transform:
- [translate, -.5, 1, .5]
- add: pip
transform:
- [translate, .5, 1, -.5]
- add: pip
transform:
- [translate, 0, 1, 0]
#6 on the back face
- define: pip6
value:
add: group
children:
- add: pip
transform:
- [translate, -0.5, -.5, 1]
- add: pip
transform:
- [translate, .5, .5, 1]
- add: pip
transform:
- [translate, -.5, .5, 1]
- add: pip
transform:
- [translate, .5, -.5, 1]
- add: pip
transform:
- [translate, -.5, 0, 1]
- add: pip
transform:
- [translate, .5, 0, 1]
- define: pips
value:
add: group
children:
- add: pip1
- add: pip2
- add: pip3
- add: pip4
- add: pip5
- add: pip6
- define: makecutcylinder
value:
add: cylinder
closed: true
min: -1.1
max: 1.1
transform:
- [scale, 0.18, 1, 0.18]
- [translate, 0, 1, 0]
- define: cutcylinderygroup
value:
add: group
children:
- add: makecutcylinder
transform:
- [translate, -1, 0, -1]
- add: makecutcylinder
transform:
- [translate, -1, 0, 1]
- add: makecutcylinder
transform:
- [translate, 1, 0, -1]
- add: makecutcylinder
transform:
- [translate, 1, 0, 1]
- define: cutcylinderxgroup
value:
add: cutcylinderygroup
transform:
- [translate, 0, -1, 0]
- [rotate-z, 1.5707963]
- [translate, 0, 1, 0]
- define: cutcylinderzgroup
value:
add: cutcylinderygroup
transform:
- [translate, 0, -1, 0]
- [rotate-x, 1.5707963]
- [translate, 0, 1, 0]
- define: cutgroup
value:
add: csg
operation: union
left:
add: csg
operation: union
left:
add: cutcylinderygroup
right:
add: cutcylinderzgroup
right:
add: cutcylinderxgroup
- define: makeaddcylinder
value:
add: cylinder
closed: false
min: -.82
max: .82
transform:
- [scale, 0.18, 1, 0.18]
- [translate, 0, 1, 0]
material:
ambient: 0.2
diffuse: .75
specular: .8
reflective: .1
color: [ 0.7, 0.1, 0.1]
- define: addcylinderygroup
value:
add: group
children:
- add: makeaddcylinder
transform:
- [translate, .82, 0, .82]
- add: makeaddcylinder
transform:
- [translate, .82, 0, -.82]
- add: makeaddcylinder
transform:
- [translate, -.82, 0, .82]
- add: makeaddcylinder
transform:
- [translate, -.82, 0, -.82]
- define: addcylinderxgroup
value:
add: addcylinderygroup
transform:
- [translate, 0, -1, 0]
- [rotate-z, 1.5707963]
- [translate, 0, 1, 0]
- define: addcylinderzgroup
value:
add: addcylinderygroup
transform:
- [translate, 0, -1, 0]
- [rotate-x, 1.5707963]
- [translate, 0, 1, 0]
- define: addcylindergroup
value:
add: group
children:
- add: addcylinderygroup
- add: addcylinderxgroup
- add: addcylinderzgroup
- define: addsphere
value:
add: sphere
transform:
- [scale, .18, .18, .18]
- [translate, 0, 1, 0]
- define: addspheregroup
value:
add: group
children:
- add: addsphere
transform:
- [translate, .82, .82, .82]
- add: addsphere
transform:
- [translate, .82, .82, -.82]
- add: addsphere
transform:
- [translate, -.82, .82, .82]
- add: addsphere
transform:
- [translate, -.82, .82, -.82]
- add: addsphere
transform:
- [translate, .82, -.82, .82]
- add: addsphere
transform:
- [translate, .82, -.82, -.82]
- add: addsphere
transform:
- [translate, -.82, -.82, .82]
- add: addsphere
transform:
- [translate, -.82, -.82, -.82]
- define: addgroup
value:
add: group
children:
- add: addspheregroup
- add: addcylindergroup
- define: makeroundedcube
value:
add: csg
operation: union
left:
add: csg
operation: difference
left:
add: die-cube
right:
add: cutgroup
right:
add: addgroup
- define: red_die
value:
add: csg
operation: difference
left:
add: makeroundedcube
material: red
right:
add: pips
# ======================================================
# the scene
# ======================================================
#a die
- add: red_die
