# INTERFERE Command [GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [Commands](Help%20System/GSTARCAD/2027/Commands/(Commands).md) → [I](Help%20System/GSTARCAD/2027/Commands/I/(I).md) ## Function Description: This command is used to create a temporary 3D solid from the interferences between two sets of selected 3D solids. The interferences are highlighted to display a temporary 3D solid. Users can also choose whether to reserve the overlapping parts. If defined one selection set, the INTERFERE command prompts to compare and check all solid objects in group. If defined two selection sets, the INTERFERE command prompts to compare and check objects in the first group and the second group. If there is a part of belongs to both selection set, the INTERFERE takes it as one part of the first group and ignores it in the second group. Pressing Enter to start the interference testing between sets. The [Interference Checking dialog box](Help%20System/GSTARCAD/2027/Commands/03%20Dialog%20Boxes/I/INTERFERE%20Dialog%20Box.md) is displayed. ## Command Access: > **Icon:**  > **Menu:** Modify > 3D Operations > Interference Checking > **Ribbon:** 3D > Solid Editing > Interference Checking > **Toolbar:** / > **Command:** INTERFERE > **Alias:** INF ## Command Prompts: ``` Select first set of objects or [Nested selection/Settings]: ```  --- **Related Tasks：** - [To Change the Display for Interference Checking (GstarCAD 2026)](../../../2026/Commands/01%20Procedures/To%20Change%20the%20Display%20for%20Interference%20Checking.md) --- [Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/commandReferences_I/INTERFERE.html) · © Gstarsoft Co., Ltd.