Description
This object takes care of invoking the proper ChDrawer methods, like UpdateBuffers(), depending on the type of the element.
The reason is that the UpdateBuffers() could be a virtual method from a ChFieldElement base class, but we prefer not to pollute the ChFieldElement base class with stuff that is related to drawing into a ChTriangleMeshConnected. So this ChElementDrawerDispatcher class works like an 'extension' of the polymorphism of finite elements, at the cost of a lookup into hash map that associates element type_index to the corresponding ChDrawerXXYY. [To do performance optimization: since this is invoked many times iterating on a stl container, and most likely elements are stored in sequences of same type_index, the hash lookup in drawers.find(..) could be shortcut by first testing if the last key-value can be reused.]
#include <ChDrawer.h>
Public Member Functions | |
| template<typename T > | |
| void | RegisterDrawer (std::unique_ptr< ChDrawer > calc) |
| void | IncrementBufferSizes (ChFieldElement &melement, size_t &num_vertexes, size_t &num_triangles, size_t &num_normals) |
| This method takes a ChFieldElement and increments the counters of total used number of triangle vertexes, number of triangles, number of normals, used in a triangle mesh that shows the shape of the finite element. More... | |
| void | UpdateBuffers (ChFieldElement &melement, ChTriangleMeshConnected &mmesh, size_t &vert_offset, size_t &tri_offset, size_t &norm_offset) |
| This method takes a ChFieldElement and, given a ChTriangleMeshConnected& mmesh, does this: 1) per each triangle from tri_offset sets the indexes in mmesh.GetIndicesVertexes() to 3 triangle vertexes; 2) per each triangle from tri_offset sets the indexes in mmesh.GetIndicesNormals() to 3 triangle normals; 3) per each normal from norm_offset sets its value in mmesh.GetCoordsNormals() (can be automated via ChDrawer::AutoComputeNormals()); Assumes there is no need to update the position of vertexes in mmesh.GetCoordsVertices() because already update by the caller, that sets the first N triangle vertices as the N finite element nodes - and same for N colors in mmesh.GetCoordsColors(), and N scalars/vectors/etc in myproperty.data of all properties in mmesh.GetPropertiesPerVertex(). More... | |
Member Function Documentation
◆ IncrementBufferSizes()
|
inline |
This method takes a ChFieldElement and increments the counters of total used number of triangle vertexes, number of triangles, number of normals, used in a triangle mesh that shows the shape of the finite element.
This function is called on all finite elements, to get the total amount of vertexes, triangles etc. in a ChTriangleMeshConnected that will be used to show finite elements on the screen.
◆ UpdateBuffers()
|
inline |
This method takes a ChFieldElement and, given a ChTriangleMeshConnected& mmesh, does this: 1) per each triangle from tri_offset sets the indexes in mmesh.GetIndicesVertexes() to 3 triangle vertexes; 2) per each triangle from tri_offset sets the indexes in mmesh.GetIndicesNormals() to 3 triangle normals; 3) per each normal from norm_offset sets its value in mmesh.GetCoordsNormals() (can be automated via ChDrawer::AutoComputeNormals()); Assumes there is no need to update the position of vertexes in mmesh.GetCoordsVertices() because already update by the caller, that sets the first N triangle vertices as the N finite element nodes - and same for N colors in mmesh.GetCoordsColors(), and N scalars/vectors/etc in myproperty.data of all properties in mmesh.GetPropertiesPerVertex().
However, if one has more triangle vertexes than N element nodes, there could be an additional task: 4) (optional) per each vertex beyond the N element nodes, interpolate position/color/properties by looking at values already updated in the position/color/properties of the first N vertexes of the mmesh, starting from vert_offset.
The documentation for this class was generated from the following file:
- /builds/uwsbel/chrono/src/chrono/fea/ChDrawer.h
