Volumes

Functions
HAPI_DECL	HAPI_GetVolumeInfo (const HAPI_Session *session, HAPI_NodeId node_id, HAPI_PartId part_id, HAPI_VolumeInfo *volume_info)
	Retrieve any meta-data about the volume primitive, including its transform, location, scale, taper, resolution. More...
HAPI_DECL	HAPI_GetFirstVolumeTile (const HAPI_Session *session, HAPI_NodeId node_id, HAPI_PartId part_id, HAPI_VolumeTileInfo *tile)
	Iterate through a volume based on 8x8x8 sections of the volume Start iterating through the value of the volume at part_id. More...
HAPI_DECL	HAPI_GetNextVolumeTile (const HAPI_Session *session, HAPI_NodeId node_id, HAPI_PartId part_id, HAPI_VolumeTileInfo *tile)
	Iterate through a volume based on 8x8x8 sections of the volume Continue iterating through the value of the volume at part_id. More...
HAPI_DECL	HAPI_GetVolumeVoxelFloatData (const HAPI_Session *session, HAPI_NodeId node_id, HAPI_PartId part_id, int x_index, int y_index, int z_index, float *values_array, int value_count)
	Retrieve floating point values of the voxel at a specific index. Note that you must call HAPI_GetVolumeInfo() prior to this call. More...
HAPI_DECL	HAPI_GetVolumeTileFloatData (const HAPI_Session *session, HAPI_NodeId node_id, HAPI_PartId part_id, float fill_value, const HAPI_VolumeTileInfo *tile, float *values_array, int length)
	Retrieve floating point values of the voxels pointed to by a tile. Note that a tile may extend beyond the limits of the volume so not all values in the given buffer will be written to. Voxels outside the volume will be initialized to the given fill value. More...
HAPI_DECL	HAPI_GetVolumeVoxelIntData (const HAPI_Session *session, HAPI_NodeId node_id, HAPI_PartId part_id, int x_index, int y_index, int z_index, int *values_array, int value_count)
	Retrieve integer point values of the voxel at a specific index. Note that you must call HAPI_GetVolumeInfo() prior to this call. More...
HAPI_DECL	HAPI_GetVolumeTileIntData (const HAPI_Session *session, HAPI_NodeId node_id, HAPI_PartId part_id, int fill_value, const HAPI_VolumeTileInfo *tile, int *values_array, int length)
	Retrieve integer point values of the voxels pointed to by a tile. Note that a tile may extend beyond the limits of the volume so not all values in the given buffer will be written to. Voxels outside the volume will be initialized to the given fill value. More...
HAPI_DECL	HAPI_GetHeightFieldData (const HAPI_Session *session, HAPI_NodeId node_id, HAPI_PartId part_id, float *values_array, int start, int length)
	Get the height field data for a terrain volume as a flattened 2D array of float heights. Should call HAPI_GetVolumeInfo() first to make sure the volume info is initialized. More...
HAPI_DECL	HAPI_SetVolumeInfo (const HAPI_Session *session, HAPI_NodeId node_id, HAPI_PartId part_id, const HAPI_VolumeInfo *volume_info)
	Set the volume info of a geo on a geo input. More...
HAPI_DECL	HAPI_SetVolumeTileFloatData (const HAPI_Session *session, HAPI_NodeId node_id, HAPI_PartId part_id, const HAPI_VolumeTileInfo *tile, const float *values_array, int length)
	Set the values of a float tile: this is an 8x8x8 subsection of the volume. More...
HAPI_DECL	HAPI_SetVolumeTileIntData (const HAPI_Session *session, HAPI_NodeId node_id, HAPI_PartId part_id, const HAPI_VolumeTileInfo *tile, const int *values_array, int length)
	Set the values of an int tile: this is an 8x8x8 subsection of the volume. More...
HAPI_DECL	HAPI_SetVolumeVoxelFloatData (const HAPI_Session *session, HAPI_NodeId node_id, HAPI_PartId part_id, int x_index, int y_index, int z_index, const float *values_array, int value_count)
	Set the values of a float voxel in the volume. More...
HAPI_DECL	HAPI_SetVolumeVoxelIntData (const HAPI_Session *session, HAPI_NodeId node_id, HAPI_PartId part_id, int x_index, int y_index, int z_index, const int *values_array, int value_count)
	Set the values of a integer voxel in the volume. More...
HAPI_DECL	HAPI_GetVolumeBounds (const HAPI_Session *session, HAPI_NodeId node_id, HAPI_PartId part_id, float *x_min, float *y_min, float *z_min, float *x_max, float *y_max, float *z_max, float *x_center, float *y_center, float *z_center)
	Get the bounding values of a volume. More...
HAPI_DECL	HAPI_SetHeightFieldData (const HAPI_Session *session, HAPI_NodeId node_id, HAPI_PartId part_id, const char *name, const float *values_array, int start, int length)
	Set the height field data for a terrain volume with the values from a flattened 2D array of float. HAPI_SetVolumeInfo() should be called first to make sure that the volume and its info are initialized. More...
HAPI_DECL	HAPI_GetVolumeVisualInfo (const HAPI_Session *session, HAPI_NodeId node_id, HAPI_PartId part_id, HAPI_VolumeVisualInfo *visual_info)
	Retrieve the visualization meta-data of the volume. More...

Detailed Description

Functions for working with Volume data

Function Documentation

HAPI_DECL HAPI_GetFirstVolumeTile	(	const HAPI_Session *	session,
		HAPI_NodeId	node_id,
		HAPI_PartId	part_id,
		HAPI_VolumeTileInfo *	tile
	)

Iterate through a volume based on 8x8x8 sections of the volume Start iterating through the value of the volume at part_id.

Parameters

[in]	session	The session of Houdini you are interacting with. See HAPI_Sessions for more on sessions. Pass NULL to just use the default in-process session.
[in]	node_id	The node id.
[in]	part_id	The part id.
[out]	tile	The tile info referring to the first tile in the volume at part_id.

HAPI_DECL HAPI_GetHeightFieldData	(	const HAPI_Session *	session,
		HAPI_NodeId	node_id,
		HAPI_PartId	part_id,
		float *	values_array,
		int	start,
		int	length
	)

Get the height field data for a terrain volume as a flattened 2D array of float heights. Should call HAPI_GetVolumeInfo() first to make sure the volume info is initialized.

Parameters

[in]	session	The session of Houdini you are interacting with. See HAPI_Sessions for more on sessions. Pass NULL to just use the default in-process session.
[in]	node_id	The node id.
[in]	part_id	The part id.
[out]	values_array	Heightfield flattened array. Should be at least the size of start + length.
[in]	start	The start at least 0 and at most ( HAPI_VolumeInfo::xLength * HAPI_VolumeInfo::yLength ) length.
[in]	length	The length should be at least 1 or at most ( HAPI_VolumeInfo::xLength * HAPI_VolumeInfo::yLength ) start.

HAPI_DECL HAPI_GetNextVolumeTile	(	const HAPI_Session *	session,
		HAPI_NodeId	node_id,
		HAPI_PartId	part_id,
		HAPI_VolumeTileInfo *	tile
	)

Iterate through a volume based on 8x8x8 sections of the volume Continue iterating through the value of the volume at part_id.

Parameters

[in]	session	The session of Houdini you are interacting with. See HAPI_Sessions for more on sessions. Pass NULL to just use the default in-process session.
[in]	node_id	The node id.
[in]	part_id	The part id.
[out]	tile	The tile info referring to the next tile in the set of tiles associated with the volume at this part.

HAPI_DECL HAPI_GetVolumeBounds	(	const HAPI_Session *	session,
		HAPI_NodeId	node_id,
		HAPI_PartId	part_id,
		float *	x_min,
		float *	y_min,
		float *	z_min,
		float *	x_max,
		float *	y_max,
		float *	z_max,
		float *	x_center,
		float *	y_center,
		float *	z_center
	)

Get the bounding values of a volume.

Parameters

[in]	session	The session of Houdini you are interacting with. See HAPI_Sessions for more on sessions. Pass NULL to just use the default in-process session.
[in]	node_id	The node id.
[in]	part_id	The part id.
[out]	x_min	The minimum x value of the volume's bounding box. Can be null if you do not want this value.
[out]	y_min	The minimum y value of the volume's bounding box. Can be null if you do not want this value.
[out]	z_min	The minimum z value of the volume's bounding box. Can be null if you do not want this value.
[out]	x_max	The maximum x value of the volume's bounding box. Can be null if you do not want this value.
[out]	y_max	The maximum y value of the volume's bounding box. Can be null if you do not want this value.
[out]	z_max	The maximum z value of the volume's bounding box. Can be null if you do not want this value.
[out]	x_center	The x value of the volume's bounding box center. Can be null if you do not want this value.
[out]	y_center	The y value of the volume's bounding box center. Can be null if you do not want this value.
[out]	z_center	The z value of the volume's bounding box center. Can be null if you do not want this value.

HAPI_DECL HAPI_GetVolumeInfo	(	const HAPI_Session *	session,
		HAPI_NodeId	node_id,
		HAPI_PartId	part_id,
		HAPI_VolumeInfo *	volume_info
	)

Retrieve any meta-data about the volume primitive, including its transform, location, scale, taper, resolution.

Parameters

[in]	session	The session of Houdini you are interacting with. See HAPI_Sessions for more on sessions. Pass NULL to just use the default in-process session.
[in]	node_id	The node id.
[in]	part_id	The part id.
[out]	volume_info	The meta-data associated with the volume on the part specified by the previous parameters.

HAPI_DECL HAPI_GetVolumeTileFloatData	(	const HAPI_Session *	session,
		HAPI_NodeId	node_id,
		HAPI_PartId	part_id,
		float	fill_value,
		const HAPI_VolumeTileInfo *	tile,
		float *	values_array,
		int	length
	)

Retrieve floating point values of the voxels pointed to by a tile. Note that a tile may extend beyond the limits of the volume so not all values in the given buffer will be written to. Voxels outside the volume will be initialized to the given fill value.

Parameters

[in]	session	The session of Houdini you are interacting with. See HAPI_Sessions for more on sessions. Pass NULL to just use the default in-process session.
[in]	node_id	The node id.
[in]	part_id	The part id.
[in]	fill_value	Value that will be used to fill the values_array. This is useful so that you can see what values have actually been written to.
[in]	tile	The tile to retrieve.
[out]	values_array	The values of the tile.
[in]	length	The length should be ( 8 ^ 3 ) * tupleSize.

HAPI_DECL HAPI_GetVolumeTileIntData	(	const HAPI_Session *	session,
		HAPI_NodeId	node_id,
		HAPI_PartId	part_id,
		int	fill_value,
		const HAPI_VolumeTileInfo *	tile,
		int *	values_array,
		int	length
	)

Retrieve integer point values of the voxels pointed to by a tile. Note that a tile may extend beyond the limits of the volume so not all values in the given buffer will be written to. Voxels outside the volume will be initialized to the given fill value.

Parameters

[in]	session	The session of Houdini you are interacting with. See HAPI_Sessions for more on sessions. Pass NULL to just use the default in-process session.
[in]	node_id	The node id.
[in]	part_id	The part id.
[in]	fill_value	Value that will be used to fill the values_array. This is useful so that you can see what values have actually been written to.
[in]	tile	The tile to retrieve.
[out]	values_array	The values of the tile.
[in]	length	The length should be ( 8 ^ 3 ) * tupleSize.

HAPI_DECL HAPI_GetVolumeVisualInfo	(	const HAPI_Session *	session,
		HAPI_NodeId	node_id,
		HAPI_PartId	part_id,
		HAPI_VolumeVisualInfo *	visual_info
	)

Retrieve the visualization meta-data of the volume.

Parameters

[in]	session	The session of Houdini you are interacting with. See HAPI_Sessions for more on sessions. Pass NULL to just use the default in-process session.
[in]	node_id	The node id.
[in]	part_id	The part id.
[out]	visual_info	The meta-data associated with the visualization settings of the part specified by the previous parameters.

HAPI_DECL HAPI_GetVolumeVoxelFloatData	(	const HAPI_Session *	session,
		HAPI_NodeId	node_id,
		HAPI_PartId	part_id,
		int	x_index,
		int	y_index,
		int	z_index,
		float *	values_array,
		int	value_count
	)

Retrieve floating point values of the voxel at a specific index. Note that you must call HAPI_GetVolumeInfo() prior to this call.

Parameters

[in]	session	The session of Houdini you are interacting with. See HAPI_Sessions for more on sessions. Pass NULL to just use the default in-process session.
[in]	node_id	The node id.
[in]	part_id	The part id.
[in]	x_index	The x index/coordinate of the voxel.
[in]	y_index	The y index/coordinate of the voxel.
[in]	z_index	The z index/coordinate of the voxel.
[out]	values_array	The values of the voxel.
[in]	value_count	Should be equal to the volume's HAPI_VolumeInfo::tupleSize.

HAPI_DECL HAPI_GetVolumeVoxelIntData	(	const HAPI_Session *	session,
		HAPI_NodeId	node_id,
		HAPI_PartId	part_id,
		int	x_index,
		int	y_index,
		int	z_index,
		int *	values_array,
		int	value_count
	)

Retrieve integer point values of the voxel at a specific index. Note that you must call HAPI_GetVolumeInfo() prior to this call.

Parameters

[in]	session	The session of Houdini you are interacting with. See HAPI_Sessions for more on sessions. Pass NULL to just use the default in-process session.
[in]	node_id	The node id.
[in]	part_id	The part id.
[in]	x_index	The x index/coordinate of the voxel.
[in]	y_index	The y index/coordinate of the voxel.
[in]	z_index	The z index/coordinate of the voxel.
[out]	values_array	The values of the voxel.
[in]	value_count	Should be equal to the volume's HAPI_VolumeInfo::tupleSize.

HAPI_DECL HAPI_SetHeightFieldData	(	const HAPI_Session *	session,
		HAPI_NodeId	node_id,
		HAPI_PartId	part_id,
		const char *	name,
		const float *	values_array,
		int	start,
		int	length
	)

Set the height field data for a terrain volume with the values from a flattened 2D array of float. HAPI_SetVolumeInfo() should be called first to make sure that the volume and its info are initialized.

Parameters

[in]	session	The session of Houdini you are interacting with. See HAPI_Sessions for more on sessions. Pass NULL to just use the default in-process session.
[in]	node_id	The node id.
[in]	part_id	The part id.
[in]	values_array	Heightfield flattened array. Should be at least the size of start + length.
[in]	start	The start at least 0 and at most ( HAPI_VolumeInfo::xLength * HAPI_VolumeInfo::yLength ) - length.
[in]	length	The length should be at least 1 or at most ( HAPI_VolumeInfo::xLength * HAPI_VolumeInfo::yLength ) - start.
[in]	name	The name of the volume used for the heightfield. If set to "height" the values will be used for height information, if not, the data will used as a mask.

HAPI_DECL HAPI_SetVolumeInfo	(	const HAPI_Session *	session,
		HAPI_NodeId	node_id,
		HAPI_PartId	part_id,
		const HAPI_VolumeInfo *	volume_info
	)

Set the volume info of a geo on a geo input.

Parameters

[in]	session	The session of Houdini you are interacting with. See HAPI_Sessions for more on sessions. Pass NULL to just use the default in-process session.
[in]	node_id	The node id.
[in]	part_id	The part id.
[in]	volume_info	All volume information that can be specified per volume. This includes the position, orientation, scale, data format, tuple size, and taper. The tile size is always 8x8x8.

HAPI_DECL HAPI_SetVolumeTileFloatData	(	const HAPI_Session *	session,
		HAPI_NodeId	node_id,
		HAPI_PartId	part_id,
		const HAPI_VolumeTileInfo *	tile,
		const float *	values_array,
		int	length
	)

Set the values of a float tile: this is an 8x8x8 subsection of the volume.

Parameters

[in]	session	The session of Houdini you are interacting with. See HAPI_Sessions for more on sessions. Pass NULL to just use the default in-process session.
[in]	node_id	The node id.
[in]	part_id	The part id.
[in]	tile	The tile that the volume will be input into.
[in]	values_array	The values of the individual voxel tiles in the volume. The length of this array should be ( 8 ^ 3 ) * tupleSize.
[in]	length	The length should be ( 8 ^ 3 ) * tupleSize.

HAPI_DECL HAPI_SetVolumeTileIntData	(	const HAPI_Session *	session,
		HAPI_NodeId	node_id,
		HAPI_PartId	part_id,
		const HAPI_VolumeTileInfo *	tile,
		const int *	values_array,
		int	length
	)

Set the values of an int tile: this is an 8x8x8 subsection of the volume.

Parameters

[in]	session	The session of Houdini you are interacting with. See HAPI_Sessions for more on sessions. Pass NULL to just use the default in-process session.
[in]	node_id	The node id.
[in]	part_id	The part id.
[in]	tile	The tile that the volume will be input into.
[in]	values_array	The values of the individual voxel tiles in the volume. The length of this array should be ( 8 ^ 3 ) * tupleSize.
[in]	length	The length should be ( 8 ^ 3 ) * tupleSize.

HAPI_DECL HAPI_SetVolumeVoxelFloatData	(	const HAPI_Session *	session,
		HAPI_NodeId	node_id,
		HAPI_PartId	part_id,
		int	x_index,
		int	y_index,
		int	z_index,
		const float *	values_array,
		int	value_count
	)

Set the values of a float voxel in the volume.

Parameters

[in]	session	The session of Houdini you are interacting with. See HAPI_Sessions for more on sessions. Pass NULL to just use the default in-process session.
[in]	node_id	The node id.
[in]	part_id	The part id.
[in]	x_index	The x index/coordinate of the voxel.
[in]	y_index	The y index/coordinate of the voxel.
[in]	z_index	The z index/coordinate of the voxel.
[in]	values_array	The values of the voxel.
[in]	value_count	Should be equal to the volume's HAPI_VolumeInfo::tupleSize.

HAPI_DECL HAPI_SetVolumeVoxelIntData	(	const HAPI_Session *	session,
		HAPI_NodeId	node_id,
		HAPI_PartId	part_id,
		int	x_index,
		int	y_index,
		int	z_index,
		const int *	values_array,
		int	value_count
	)

Set the values of a integer voxel in the volume.

Parameters

[in]	session	The session of Houdini you are interacting with. See HAPI_Sessions for more on sessions. Pass NULL to just use the default in-process session.
[in]	node_id	The node id.
[in]	part_id	The part id.
[in]	x_index	The x index/coordinate of the voxel.
[in]	y_index	The y index/coordinate of the voxel.
[in]	z_index	The z index/coordinate of the voxel.
[in]	values_array	The values of the voxel.
[in]	value_count	Should be equal to the volume's HAPI_VolumeInfo::tupleSize.