Precise Edits

The canvas is generative, not parametric: it reasons in proportions and visual plausibility, not millimeters and coordinates. When you describe a change in words, the AI re-imagines the region you named, and whatever sits next to that region can move with it. Almost every "it changed something I didn't ask for" problem has the same fix: hand the system geometry instead of a description. Four techniques do most of the work.

1. Step 1. Masks: the strongest guarantee

   A mask is the hardest boundary you can draw: only the pixels inside it can change, and everything outside physically cannot. Select the region with the Selection tool (M), press Enter to turn the selection into a mask, then prompt the change. Use this whenever the rest of the piece must hold exactly: swapping a stone, reshaping one section, removing an element. See Masks.

2. Step 2. Painted stones: exact placement and orientation

   Painting the stones onto your sketch is the most direct way to fix where they sit. The brush library includes stone brushes for every major cut, plus pearls and cabochons (see Brushes). Paint them in the position and size you want, and use the brush's Rotation & Squeeze control to angle each stamp. The AI treats painted stones as explicit placements to honor, far more dependable than describing an angle in words.

3. Step 3. Arrows on the canvas: unambiguous targeting

   The AI reads annotations on the canvas as targeting information, which leaves no ambiguity about which part of the piece you mean. Draw an arrow (Shape tool → Arrow, or Shift + A) pointing at the element, then refer to it in the prompt: "remove the interlocks shown by the arrows on canvas."

4. Step 4. Influence: how much each input is allowed to matter

   Influence decides how much authority each input has over the result, so it is how you rank your inputs against each other. Set the canvas and each reference to the level it deserves (see Influence). Structure you must keep: Full. Loose inspiration: Low. Balance the sliders rather than maxing everything.

Removing elements

Removal is the hardest edit type, because the AI has to re-imagine whatever sat behind the element you took out. What works:

• One element at a time. Incremental edits are significantly more reliable than a list of deletions.
• Describe the end state, not the deletion. "The stone sits directly against the pavé, held by prongs only" beats "remove the bezel."
• Mask the exact region for dense pieces. Where bezels sit tightly between stones and pavé, an unmasked removal tends to keep or merely thin the element.

Know what won't work

Some requests fail no matter how you word them, and knowing which ones saves you a lot of retries.

• Exact dimensions by prompt are declined by design: the AI was too unreliable at measurements, so it refuses rather than guessing. Use relative language, or make the change in your CAD tool.
• Alternate views are inference, not rotation. Asking a 2D image for "the back" re-imagines it. Attach any real view you have (even a rough side sketch): completing from partial evidence is far more accurate than inventing. For views that at least agree with each other, use Generate 3D. See 3D on the Canvas.
• When the AI struggles to satisfy a prompt, variance increases. If results start swinging wildly, don't push the same prompt harder: simplify it, split it, or switch to a mask.