Geometry3D component - extensions

Contents:

1. Triangulation of primitives (Cone, Cylinder, Sphere, Circle2D, Disk2D)

You can control the triangulation of various geometry nodes:

• Cone {
    ...
    SFInt32    [in,out]      slices      -1          # {-1} + [3, infinity)
    SFInt32    [in,out]      stacks      -1          # {-1} + [2, infinity)
  }
  

  In Pascal see TConeNode.

• Cylinder {
    ...
    SFInt32    [in,out]      slices      -1          # {-1} + [3, infinity)
    SFInt32    [in,out]      stacks      -1          # {-1} + [2, infinity)
  }
  

  In Pascal see TCylinderNode.

• Sphere {
    ...
    SFInt32    [in,out]      slices      -1          # {-1} + [3, infinity)
    SFInt32    [in,out]      stacks      -1          # {-1} + [2, infinity)
  }
  

  In Pascal see TSphereNode.

• Circle2D {
    ...
    SFInt32    [in,out]      slices      -1          # {-1} + [3, infinity)
  }
  

  In Pascal see TCircle2DNode.

• Disk2D {
    ...
    SFInt32    [in,out]      slices      -1          # {-1} + [3, infinity)
  }
  

  In Pascal see TDisk2DNode.

Slices divide the objects like "slices of a pizza".

Stacks divide the objects like "stacks of a tower".

You can easily test the effects of these fields by investigating your models in view3dscene. You can view in Wireframe mode to see the triangulation. You can try it on our demo models, for example

• x3d/castle_extensions/triangulation.x3dv
• 2d/2d_geometry_nodes.x3dv

Special value -1 for any of these fields means that we use a default value specified by the global variables DefaultTriangulationSlices, DefaultTriangulationStacks.

Generally, triangulate more if the object is large and you want to see the geometry precisely.

If you use lighting with Gouraud shading then also you need a reasonable triangulation to see the light effects (like spotlight cone effect) precisely. But by default in CGE we now use Phong shading which looks good regardless of the triangulation.

2. Specify orientation of primitives (Box.ccw)

We add Box.ccw field. The default TRUE means that box is visible only from the outside. You can specify FALSE to make it visible only from the inside. Note that you can also use solid FALSE to make it visible from both sides.

Box {
  ...
  SFBool     []            ccw         TRUE      
}