Published 2026-08-31 · 2 min read
What parametric modeling means and why it changes your speed
In an ordinary editor a cube is a pile of points in space. In a parametric one, the cube is a recipe: 'length 40, width 20, height 15, corner radius 2'. Change a number in the recipe and the shape rebuilds itself. The difference feels small until a client asks for another size.
Shape as a recipe, not a drawing
A parametric object remembers how it was built. A gear is not a collection of teeth but 'module 2, 24 teeth, thickness 8' — and when you type 30 instead of 24, the teeth redraw correctly, with the right geometry.
This moves the work from drawing to deciding. You stop spending time constructing and start spending it choosing numbers.
What you actually gain
- Changes take seconds instead of hours: widen the house from 9 to 10 m and walls, windows and slabs move on their own.
- Errors do not accumulate: the shape is rebuilt from scratch every time, so no leftovers from old versions remain.
- You can produce variants: the same project at three widths to show a client.
- Parts stay correct: a hole defined as a parameter stays centred even when the part grows.
Where it does not help
Parameters describe regular things well: boxes, pipes, wheels, walls, stairs. They describe organic things badly — a sculpture, a character, a rock. Free drawing or sculpting suits those better.
That is why serious programs combine both: build the volumes parametrically and work freely only where it is genuinely needed.
What it looks like in practice
In GrafitGo each of the 43 objects has its own parameter set, shown in the right panel as plain fields. Drag a slider and the shape changes in real time.
A house has width, depth, floor count, room count, storey height and roof type. A window has width, height, position along the wall and frame thickness. Nothing is drawn by hand, so nothing has to be redone by hand.
Does parametric mean I cannot move a single point?
Generally yes, and that is the point: the shape stays consistent. When you genuinely need a free form, draw it as a sketch and extrude it.
Are parameters lost on export?
Yes, for STL, OBJ and GLB. Parameters live in the project file; exchange formats only keep the result.
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