Blender 5.0 brings a major upgrade to the Geometry Nodes system: the introduction of a dedicated volume grid data type. Unlike the previous workflow, which relied on converting volumes to meshes or point clouds, the new grid sockets let artists create, edit, and combine volumetric data directly inside node trees.
What is a Volume Grid?
A volume grid stores values on a regular 3‑D lattice. The grid can hold floats (e.g., density), vectors (e.g., velocity), or other primitive types. Each grid is represented by a uniquely coloured socket in Geometry Nodes, making it clear whether the node expects a float, vector, or other grid.
Key Nodes and Workflow
- Field to Grid: evaluates a field (noise, position, etc.) for every voxel and writes the result into a new grid.
- Sample Grid / Sample Grid Index: reads grid values at arbitrary positions or integer coordinates.
- Set Grid Transform and Grid Info: control the grid’s location, rotation and scale in object space.
- Math Nodes: can operate directly on grids, allowing voxel‑wise addition, multiplication, etc., provided the grids share the same transform.
OpenVDB Under the Hood
The implementation relies on the industry‑standard OpenVDB library. OpenVDB stores data sparsely using tiles (blocks of voxels with identical values) and an active status flag that falls back to a background value when a voxel is inactive. This makes even large grids (e.g., 100³ voxels) memory‑efficient.
Signed‑Distance‑Field (SDF) Grids
Float grids can be used as SDFs, where each voxel stores the distance to the nearest surface. Negative values indicate interior space, positive values exterior, and the zero‑crossing defines the surface. SDF grids enable fast Boolean operations and smooth transitions that are difficult with meshes.
Practical Use‑Cases
- Procedural fluid simulations by advecting a density grid along a velocity field.
- Scientific visualization of volumetric datasets (e.g., temperature fields).
- Complex procedural modeling using SDF Boolean blending.
Future Outlook
Blender’s developers note that many more OpenVDB algorithms will be exposed in upcoming releases, expanding the toolbox for volumetric artists.
For a full technical overview, see the official Blender blog post dated October 7 2025.