HowTo:Use constructive solid geometry - Revision history

Reactor: /* Merge - added example image*/

2009-07-19T21:41:21Z

Merge - added example image

2009-07-19T21:32:53Z

Difference - added example image, changed text slightly

2009-07-19T21:28:58Z

Intersections

2009-07-19T21:28:16Z

Intersections - added render of example code, minor text change

2009-07-19T21:26:28Z

Union - added render from example code

2007-12-11T22:20:58Z

Difference

2007-12-11T22:14:52Z

Merge

2007-12-11T22:11:41Z

Difference

2007-12-11T22:05:59Z

Merge

2007-12-11T22:05:36Z

Merge

← Older revision		Revision as of 21:41, 19 July 2009
Line 122:		Line 122:

	On the bottom pair of spheres we can still see the edges of the spheres on the inside. On the top pair we don't. That's the difference between union and merge.		On the bottom pair of spheres we can still see the edges of the spheres on the inside. On the top pair we don't. That's the difference between union and merge.
		+	[[Image:Csg_merge_example.png\|320px\|thumb\|center\|Merge Example]]

@@ Line 68: / Line 68: @@
 == Difference ==
-Again, as with intersect and union, the difference creates a single object out of many. The difference object though is created by taking the initial object in the list and subtracting from it anything that comes into contact (and intersects) with it. A thing to note, is that any of these can be embedded with each other.
+Again, as with intersection and union, difference creates a single object out of many. The difference object is created by taking the initial object in the list and cutting away the other listed objects from it.  A thing to note is that any of the CSG operations can be embedded with each other:
 <source lang="pov">#include "colors.inc"
@@ Line 93: / Line 93: @@
+   }
 }</source>
 == Merge ==

@@ Line 65: / Line 65: @@
 What you'll see is a sphere with it's sides cut off because they are outside the intersection of the box and sphere. The corners are rounded because the corners of the box are outside the sphere.
-[[Image:Csg_intersection_example.png|320px|thumb|center|IntersectionExample]]
+[[Image:Csg_intersection_example.png|320px|thumb|center|Intersection Example]]
 == Difference ==

@@ Line 63: / Line 63: @@
 }</source>
-What you'll see is a sphere with it's sides cut off because they are outside the intersection of the box and sphere. The corners are rounded because the corners of the box are outside the sphere's edge.
+What you'll see is a sphere with it's sides cut off because they are outside the intersection of the box and sphere. The corners are rounded because the corners of the box are outside the sphere.
 == Difference ==

@@ Line 39: / Line 39: @@
 }</source>
-The above code will give the resulting object a pigment of Red, without us having to change the Blue box to Red and then others if we decide to change the color of the whole object.
+The above code will give the resulting object a pigment of Red, without us having to change the Blue box to Red and then others if we decide to change the color of the whole object.  The resultant image, rendered with anti-aliasing, is shown below:
 == Intersections ==

@@ Line 78: / Line 78: @@
+}
 difference{
-   intersect{
+   intersection{
      box{ -1, 1 }
      sphere{ 0, 1.375 }

@@ Line 99: / Line 99: @@
 #include "textures.inc"
 camera{
-   location <4, 4, -10>
+   location <0, 2, -10>
    look_at 1*y
+}
@@ Line 107: / Line 107: @@
    sphere{ 0, 1 translate 0.5*x }
    sphere{ 0, 1 translate -0.5*x }
-   texture{ T_Glass2 }
+   texture{ Glass2 }
+}
 merge{
    sphere{ 0, 1 translate 0.5*x }
    sphere{ 0, 1 translate -0.5*x }
-   texture{ T_Glass2 }
+   texture{ Glass2 }
    translate 2*y
 }</source>
 On the bottom pair of spheres we can still see the edges of the spheres on the inside. On the top pair we don't. That's the difference between union and merge.

@@ Line 80: / Line 80: @@
    intersect{
      box{ -1, 1 }
-     sphere{ 0, 1 }
+     sphere{ 0, 1.375 }
      pigment{ Red }
+   }
    union{
-     cylinder{ -2*y, 2*y, 0.25 }
+     cylinder{ -2*y, 2*y, 0.5 }
-     cylinder{ -2*x, 2*x, 0.25 }
+     cylinder{ -2*x, 2*x, 0.5 }
-     cylinder{ -2*z, 2*z, 0.25 }
+     cylinder{ -2*z, 2*z, 0.5 }
      pigment{ Blue }
+   }

@@ Line 96: / Line 96: @@
 For example, take the following code:
- [[include|#include]] "colors.inc"
+<source lang="pov">#include "colors.inc"
- [[include|#include]] "textures.inc"
+#include "textures.inc"
- [[camera]]{
+camera{
-   [[location]] <0, 1, -10>
+  location <0, 1, -10>
-   [[look_at]] 1*y
+  look_at 1*y
-−
+}
- [[light_source]]{ 1000 White }
+light_source{ 1000 White }
- [[plane]]{ y, -1 [[pigment]]{ White } }
+plane{ y, -1 pigment{ White } }
- [[union]]{
+union{
-   [[sphere]]{ 0, 1 [[translate]] 0.5*x }
+  sphere{ 0, 1 translate 0.5*x }
-   [[sphere]]{ 0, 1 [[translate]] -0.5*x }
+  sphere{ 0, 1 translate -0.5*x }
-   [[texture]]{ T_Glass2 }
+  texture{ T_Glass2 }
-−
+}
- [[merge]]{
+merge{
-   [[sphere]]{ 0, 1 [[translate]] 0.5*x }
+  sphere{ 0, 1 translate 0.5*x }
-   [[sphere]]{ 0, 1 [[translate]] -0.5*x }
+  sphere{ 0, 1 translate -0.5*x }
-   [[texture]]{ T_Glass2 }
+  texture{ T_Glass2 }
-   [[translate]] 2*y
+  translate 2*y
+}</source>
 On the bottom pair of spheres we can still see the edges of the spheres on the inside. On the top pair we don't. That's the difference between union and merge.