block generate
command
Syntax
- block generate keyword
Primary keywords:
Generate an assembly of blocks. The method for block creation is determined by the first keyword used.
- from-vrml keyword
Create blocks defined by a block geometries in a VRML file (Virtual Reality Modeling Language). Shapes in the VRML file must be closed, convex surfaces. The file must be in VRML 2.0 format. m ,,,
- break-angle f
Specify the angle between faces below which two separate faces are merged. The default is 1 degree.
- filename s
Specify the filename of the VRML file.
- from-geometry keyword
Create tetrahedral blocks to fill a closed volume defined by a geometric set.
- cut-angle f
Threshold angle for the capture of surface features. The default value is 45°. Use a larger cut angle smooth over unwanted surface features associated with the coarseness of the triangulation. Use a smaller cut angle if there are intersecting surfaces after surface remeshing.
- gradation-surface f
Rate at which, on the surface of the tetrahedral mesh, neighboring triangle sizes vary as triangles increase or decrease in size due to local size adaptation
- gradation-volume f
Rate at which neighboring tetrahedra will increase in size away from the surface.
- maximum-edge f
Specify the maximum edge length for any tetra to be generated. The actual maximum edge length will be close to this, but the result is not guaranteed to be exact.
- minimum-edge f
Specify the minimum edge length for any tetra to be generated. The actual minimum edge length will be close to this, but the result is not guaranteed to be exact.
- merge
If specified, all the blocks in the same groups will be merged in one block
- random
If the random keyword is specified, blocks edge sizes will be assigned a uniform random distribution between the maximum and minimum specified edge sizes.
- set s
Specify the geometry set used to define the surface. By default, the current geometric set will be used.
- from-topography <keyword ...> <range>
Generates blocks by extruding surface faces in the range until they meet polygons in a geometric set. Block faces could be triangulated if they are not planar.
- break-angle f
Set a break angle greater than 0 to simplify the geometric set by merging triangular faces if the angle between them is less the f. The default is 0.
- direction v
Specify the extrusion direction that will be used to create blocks on surface faces. From a surface gridpoint, a ray will be cast in this direction until it intersects a polygon in the geomtric set. This will define the shape and size of the blocks created. By default this value will be (0,0,1). If a face normal is parallel to this direction vector (with a tolerance of about 0.5 degrees) the face will be neglected even it if is in the range.
- geometry-set s
Specify the geometry set used to define the surface to which blocks are being extruded. By default the current geometric set will be used.
- group s1 <slot s2 >
Assign the group s1 to the created blocks, in slot s2. If not specified, the default slot is Default. Use of the group logic is described in Groups.
- plane keyword
Give the
plane
keyword to indicate that the extrusion is to a plane rather than a geometric set. The plane must be defined by anormal
andorigin
.- normal v
Give the normal to the plane to which you are extruding if
plane
is specified.
- origin v
Give the origin of the plane to which you are extruding if
plane
is specified.
- ratio f
Specify the ratio used to distribute blocks from the surface face to the geometric set. A ratio of 1.1 means that each block edge in that direction will be 1.1 times the length of the previous block. So, by default, a ratio of > 1 means blocks will get larger in the positive \(z\) direction. If not specified, the default ratio is 1.0.
- segments i
Specify the number of blocks layers created between the existing surface block faces and the geometry set. By default this value is 1.
- voronoi keyword
Create Voronoi blocks to fill a closed volume defined by a geometric set (restricted surface).
- cut-angle f
Threshold angle for the capture of surface features. The default value is 45°. Use a larger cut angle smooth over unwanted surface features associated with the coarseness of the triangulation. Use a smaller cut angle if there are intersecting surfaces after surface remeshing.
- gradation-surface f
Rate at which, on the restricted surface, distance between two seeds vary (increase or decrease) in size due to local size adaptation
- gradation-volume f
Rate at which distance between two seeds will increase in size away from the restricted surface.
- maximum-edge f
Specify the maximum distance between two seeds. The actual maximum distance will be close to this, but the result is not guaranteed to be exact.
- minimum-edge f
Specify the minimum distance between two seeds. The actual minimum distance will be close to this, but the result is not guaranteed to be exact.
- set s
Specify the geometry set used to define the restricted surface. By default, the current geometric set will be used.
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