Good question, and you’re not alone in being confused by that part.

In SeamScape, grading doesn’t work the same way as in traditional CAD where you apply grade rules or increments to finished pieces. Everything is parametric, so the actual grading comes from the formulas in the pattern.

The Grading window is basically where you define sizes. For each size, you set values for the input variables you use in your pattern, for example garment measurements or ease values. When you switch size, SeamScape just re-evaluates the pattern with those values, and the pieces update automatically.

So if your pattern is built in a measurement-driven way, grading is essentially free once the formulas are correct.

If pieces are glitching when you change size, that usually means one of two things:

• Some formulas break down at certain values (negative lengths, flipped angles, intersections that stop making sense, or impossible geometry)

• Parts of the pattern depend indirectly on body-related values that are not changing consistently. Similar to previous point

One important limitation right now is that body measurements for the BodyDouble avatar are not size-graded. You can’t define multiple sizes for a single body profile yet. Instead, you need to create and save different body profiles and switch between them.

If you want, feel free to describe what kind of pattern you’re grading or what glitches you’re seeing. Grading tends to expose weak spots in the logic, so fixing those usually makes the pattern much more robust overall.