# TransformBlendTable¶

class TransformBlendTable

This structure collects together the different combinations of transforms and blend amounts used by a GeomVertexData, to facilitate computing dynamic vertices on the CPU at runtime. Each vertex has a pointer to exactly one of the entries in this table, and each entry defines a number of transform/blend combinations.

This structure is used for a GeomVertexData set up to compute its dynamic vertices on the CPU. See TransformTable for one set up to compute its dynamic vertices on the graphics card.

Inheritance diagram

TransformBlendTable(void)
TransformBlendTable(TransformBlendTable const &copy)
std::size_t add_blend(TransformBlend const &blend)

Adds a new blend to the table, and returns its index number. If there is already an identical blend in the table, simply returns that number instead.

TransformBlend const &get_blend(std::size_t n) const

Returns the nth blend in the table.

static TypeHandle get_class_type(void)
int get_max_simultaneous_transforms(void) const

Returns the maximum number of unique VertexTransform objects that are applied to any one vertex simultaneously. This is the same limit reflected by GraphicsStateGuardian::get_max_vertex_transforms().

UpdateSeq get_modified(Thread *current_thread = Thread::get_current_thread()) const

Returns a counter which is guaranteed to increment at least when any TransformBlends within the table have changed.

std::size_t get_num_blends(void) const

Returns the total number of different blend combinations in the table.

int get_num_transforms(void) const

Returns the number of unique VertexTransform objects represented in the table. This will correspond to the size of the TransformTable object that would represent the same table. This is also the same limit reflected by GraphicsStateGuardian::get_max_vertex_transform_indices().

SparseArray const &get_rows(void) const

Returns the subset of rows (vertices) in the associated GeomVertexData that this TransformBlendTable actually affects.

SparseArray &modify_rows(void)

Returns a modifiable reference to the SparseArray that specifies the subset of rows (vertices) in the associated GeomVertexData that this TransformBlendTable actually affects.

void remove_blend(std::size_t n)

Removes the blend at the nth position.

void set_blend(std::size_t n, TransformBlend const &blend)

Replaces the blend at the nth position with the indicated value.

void set_rows(SparseArray const &rows)

Specifies the subset of rows (vertices) in the associated GeomVertexData that this TransformBlendTable actually affects.

void write(std::ostream &out, int indent_level) const