SketchUp
Explode All SketchUp Groups in One Click — Deep Explode
When a SketchUp model has groups and components nested several layers deep, editing it means exploding one level at a time. SketchUp’s built-in Explode command only breaks open one level of nesting per click — if a group holds groups that hold components, you keep entering and exploding container after container by hand. The Explode Deep Selected tool walks the whole hierarchy in a single pass, so deeply nested imports (DWG/IFC/3D Warehouse models that often arrive 5–6 levels deep) flatten to raw geometry at once.
How to Explode All SketchUp Groups and Components in One Click (Tutorial Video)
Steps
- Select the model. Click an object, drag a selection box, or press Ctrl+A to take everything in the current context.
- Click the Explode Deep Selected tool and select the groups and components. All groups and the elements nested inside them are exploded quickly, in one pass.
- Check the result. Open Entity Info (Window > Entity Info): the selection should now report Edges and Faces instead of Group or Component Instance.
- Purge unused definitions. Window > Model Info > Statistics > Purge Unused. Exploding an instance does not delete its component definition; the definition stays in the file until it is purged.
Watch out for the tag (layer) trap
Before you mass-explode nested groups in SketchUp, know what SketchUp does with tags. When you explode a container that is assigned to a tag other than Untagged, every line and face inside inherits that container’s tag — even geometry that was correctly sitting on Tag 0 (Untagged) while nested. After a deep explode, your raw edges and faces can end up scattered across the wrong tags, which is the opposite of the recommended workflow (geometry on Untagged, only groups/components carry tags). Turning that tag off later hides all the geometry you just flattened, a common source of confusion.
The fix is to model with the containers on Untagged before exploding, or to select all after the explode, open Entity Info and reassign the loose geometry to Untagged.
Materials after a deep explode
SketchUp colors a face in one of two ways: a material applied directly to the face, or a material applied to the parent group that the face inherits (shown as Default inside the group). When you explode a group:
- Faces painted Default take on the group’s material, so their displayed color changes immediately.
- Faces painted with a specific material keep their own material.
A group that looks like one uniform color can therefore break into a patchwork — some faces carrying the group’s old material, others their own. If color accuracy matters, check the Materials browser before exploding.
Locked objects
SketchUp cannot explode a locked group or component. If the hierarchy stops partway, right-click the remaining group, choose Unlock, and run the tool again.
Two things to remember
Explode is one-way — there is no “implode” to rebuild the original group/component tree, so undo (Ctrl+Z) is your only path back once you click off. And exploding component instances dissolves the link to their definition, so edits that used to ripple across all copies no longer do — flatten only when you truly want independent, editable geometry.
Built-in Explode vs. Explode Deep Selected
| Method | Levels removed | Use it when |
|---|---|---|
| Edit > Explode (built-in) | 1 | You want to peel off one wrapper and keep the structure inside, for example keep a sub-component and remove only the outer group. |
| Explode Deep Selected | All nested levels | You want every group and component gone in one action and raw geometry as the result. |
When flattening pays off
- Intersect Faces: Intersect Faces with Model only cuts geometry within the same context, so deeply nested groups do not intersect each other. Explode them first.
- CNC and laser export: DXF export and CAM software work with flat face/edge geometry, not a SketchUp component tree.
- Cleaning up before sharing: removing the hierarchy makes a file easier to hand to someone who does not need the original structure.
- File size: deeply nested components can carry many definitions. After exploding, Purge Unused removes the ones nothing references, which can shrink the file.
- BevelUp — round or chamfer edges into real geometry, in one click
- Decimify — reduce the polygon count of a heavy model
- Tracepen — trace an image into SketchUp faces
- TileUp — turn a face into real 3D tiles, with a take-off
- Texturic — make seamless tile textures with PBR maps
- SheetUp — turn a SketchUp model into a bill of quantities and cost estimate
- PatchUp — turn selected edges into faces, flat or curved
