QBlocker is an object creation add-on that introduces a workflow for interactively placing parametric primitives directly onto grids or the surfaces of existing objects. It provides functionality similar to primitive creation in 3ds Max, allowing users to draw cubes, cylinders, capsules, and other shapes with immediate visual feedback.

After placement, parameters such as size, radius, and segment count remain editable. The tool includes its own snapping module for precise alignment and features a custom Working Plane to assist with placing objects relative to specific surface orientations. Users can also convert existing objects into parameterized QObjects based on their bounding dimensions or use custom models for interactive placement.