Exporting geometries
This page explains how Blender Object geometries are exported to FDS geometric namelists.
Geometric namelists are those that extend their effect on a volume, a plane, a face, a segment, a point in FDS reference system.
The XB, XYZ, PB* geometry parameters specify how the shape (described in the Mesh data-block) of the current Object data-block are exported to the corresponding FDS namelist groups. For each namelist only appropriate geometry parameters and choices are shown.
When multiple FDS namelists are exported from a single Blender Object, an index or a coordinate is appended to the ID parameter to allow the user to distinguish them. The type of the appended string is specified by the Multiple IDs Suffix parameter.
If the Blender Object is exported, the FDS namelist has no XB parameter.
In this case, the grey Blender Object of the following figure is exported to one only FDS namelist, whose XB is set to match the solid bounding box of the shape.
The resulting XB represents a solid parallelepiped.
In this case, the grey Blender Object of the following figure is exported to many FDS namelist approximating the original geometry.
BlenderFDS minimizes the number of exported FDS namelists by joining the voxels in larger parallelepipeds as much as possible.
The size of the voxel is taken from the Default resolution parameter of the HEAD namelist. The resolution can be also customized for each Blender Object by filling the appropriate parameter under the XB label.
In this case, the grey Blender Object of the following figure is exported to one FDS namelist for each face of the Blender Object. The XBs are set to the projection of each of the original faces on a plane perpendicular to one of the reference axis, passing through the middle point of each original face.
The resulting XBs represent several flat faces whose sides are parallel to reference axis.
In this case, the grey Blender Object of the following figure is exported to one FDS namelist for each edge of the Blender Object. The XBs are set to exactly describe the original edges.
The resulting XBs represent several edges.
If the Blender Object is exported, the FDS namelist has no XYZ parameter.
In this case, only the Blender Object center is exported to one FDS namelist. The XYZ is set to the coordinates of the original center point.
In this case, the grey Blender Object of the following figure is exported to one FDS namelist for each vertex of the Blender Object. The XYZs are set to exactly describe the original vertices.
The resulting XYZs represent several vertices.
If the Blender Object is exported, the FDS namelist has no PBX, PBY, PBZ, parameters.
In this case, the grey Blender Object of the following figure is exported to one FDS namelist for each face of the Blender Object. The PBX, PBY, or PBZ parameters are set to the projection of each original face on a plane perpendicular to one of the reference axis, passing through the middle point of the original face.
The resulting PBX, PBY, or PBZ parameters represent several planes whose normal is parallel to one of the reference axis.