Gets a stream that can be used to write IndexPoint primitives into the buffer. 
Namespace: Autodesk.Revit.DB.DirectContext3D
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)
Since:  2017 
Syntax
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Return Value
The stream that can be used to write into this buffer.Exceptions
| Exception | Condition | 
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| Autodesk.Revit.ExceptionsInvalidOperationException | Thrown if the buffer is not mapped. -or- Thrown if the buffer has insufficient space. |