add help docs and ?

docs/nodes/3D View.md

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+# 3D View
+
+Interactive 3D surface view of a DATA_FIELD. Use the mesh input for geometry and optionally a second map input for coloring. Drag to rotate, middle-drag to pan, and right-drag or scroll to zoom.
+
+## Inputs
+
+| Name | Type | Required | Description |
+|------|------|----------|-------------|
+| field | DATA_FIELD | Yes | Height field used for mesh geometry |
+| map_field | DATA_FIELD | No | Optional separate field used for surface coloring |
+| colormap_map | COLORMAP | No | Colormap socket; overrides the colormap widget |
+
+## Outputs
+
+| Name | Type | Description |
+|------|------|-------------|
+| mesh | MESH_MODEL | Triangulated 3D surface mesh |
+| viewport | IMAGE | Snapshot of the 3D viewport |
+
+## Controls
+
+| Name | Type | Default | Description |
+|------|------|---------|-------------|
+| colormap | dropdown | auto | Colormap preset applied to the surface; hidden when colormap_map is connected |
+| z_scale | FLOAT | 1.0 | Height exaggeration factor (range 0.1–10.0) |
+| resolution | INT | 128 | Downsampling resolution for mesh generation (32–512) |
+| make_solid | BOOLEAN | False | When enabled adds a flat base and side walls to close the mesh |
+
+## Limitations
+
+- Resolution is applied by uniform subsampling; fine features smaller than one mesh step may be lost.
+- Non-square pixels emit a warning and the 3D surface represents physical scan area, not pixel grid.
+- Very high resolution values (close to 512) with large fields may be slow to render.