Catia+v5+sketch+tools -

Instead of manually adding constraints, use the Constraint Creation icon (the ruler).

Pro Tip: Enable "Diagnostics" (the green/red traffic light icon). This colors your sketch elements:

Changes the size of selected geometry. Note: Use this sparingly. Overusing scale can lead to over-constrained sketches. It is better to use dimensional constraints. catia+v5+sketch+tools

Constraints lock geometric intent. Two types:

Best Practice:

Constraints dictate how geometry behaves. A fully constrained sketch turns GREEN. An under-constrained sketch remains WHITE. Over-constrained sketches turn PURPLE or RED.

Unconstrained sketches are unstable. Always aim for Iso-constrained (Green geometry). Instead of manually adding constraints, use the Constraint

When you select a constraint (or use the Constraint tool), you can double-click it to edit the value or add/remove geometrical properties.

Solution: Use the Sketch Analysis tool (The three colored cards icon). Pro Tip: Enable "Diagnostics" (the green/red traffic light