SoDataSettexturePrecision Property |
For scalar (non-RGBA) data, specifies the size of voxel values on the GPU in bits.
Namespace: OIV.LDM.Nodes
The valid values are: 0 (default), 8 and 16. When set to 0, LDM chooses the best precision based on the size of the data type (or if specified, the number of significant bits) - meaning that LDM will store 8-bit values on the GPU for 8-bit data and store 16-bit values for all other data types.
There are several trade-offs influenced by this value, including:
8 bit values use less memory on the GPU than 16-bit values, allowing more data to be stored on the GPU. 8-bit values are adequate for many visualization tasks. But...
If the specified (or chosen) precision is smaller than the data type, then LDM must scale down the data values before sending them to the GPU.
Limitation: This is currently unavoidable for 32-bit data.
Down scaling adds some time whenever a tile of data must be sent to the GPU.
In particular, all tiles currently stored on the GPU must be rescaled if the application changes the data range (OIV.LDM.Nodes.SoDataRange node). Note: As a result, changing the data range may be slow for large volumes.
Down scaling also means "aliasing" data values, i.e. multiple data values may scale to the same value on the GPU.
Note |
---|
Field available since Open Inventor 6.0 |