Sketching (2D/3D) with pencil and paper for rough ideas.
As soon as any accuracy is needed, AutoCAD for 2D and/or Blender for 3D. Blender is usually enough, but I'm faster in AutoCAD.
If possible, I try to physically experience the new space or object, using my imagination and any props at hand. For example, I might put masking tape on the floor, following the layout of the drawing, and walk around them pretending they are obstacles.
As soon as any accuracy is needed, AutoCAD for 2D and/or Blender for 3D. Blender is usually enough, but I'm faster in AutoCAD.
If possible, I try to physically experience the new space or object, using my imagination and any props at hand. For example, I might put masking tape on the floor, following the layout of the drawing, and walk around them pretending they are obstacles.