FoundryInk Academy Academy / Animation course
Animation course

Editing points and curves

Dropping points is only half the job. The craft is in shaping them, deciding where the line rounds like a cheek and where it snaps into a hard corner like a jaw. This page is your full guide to editing an outline: the Curvature tool, the Peak, Smooth, and Simplify options, deleting points, and the transform tools that scale, rotate, shear, and skew a whole selection at once.

Read time about 15 min

1A drawn line is only rough clay

When you first drop points, FoundryInk runs a gentle default curve through them, which is a fine starting point but rarely the final line. The real character of a drawing comes from deciding, point by point, where the outline should be soft and where it should be crisp. That is editing, and it is the difference between a lumpy blob and a confident shape. Everything on this page works on points you have selected, so keep Select Points close at hand.

Draw and rig on a vector row: shapes drawn from points, with the tool rail on the left.
Draw and rig on a vector row: shapes drawn from points, with the tool rail on the left.See the full screen
Select first, shape second, every single time. If a shaping tool seems to do nothing, you almost certainly have no points selected.
Pro note
You drew the rough. Now we carve it. Grab your points and give this line some backbone.

2Curvature: the master shaping tool

Curvature is how you bend the line through a single point. Pick the tool, grab a point, and drag up to round it off or drag down to sharpen it into a corner. That one gesture, up for round and down for pointy, controls the entire feel of the outline as it passes through that anchor. Work along your line point by point, rounding the soft spots and sharpening the crisp ones, and a flat outline gains real shape.

Curvature on two shapes: the hexagon's points dragged down to corners, the circle's dragged up round.
Curvature on two shapes: the hexagon's points dragged down to corners, the circle's dragged up round.See the full screen
Up rounds, down sharpens. Say it out loud a couple of times. It is the single most useful reflex in the whole vector surface.
Pro note
Drag up for a pillow, drag down for a knife. Curvature is the dial you will spin more than any other.

3The Curve group appears when points are selected

Select one or more points and a contextual Curve group of tools appears, giving you three one-click shapers: Peak, Smooth, and Simplify. Where Curvature is a fine dial you drag, these are fast presets you tap. They act on your whole selection at once, so you can round a dozen points or sharpen a run of corners in a single click. Most cleanup passes are a mix of Curvature for feel and these three for speed.

With points selected, the Curve group appears at the bottom of the tool rail.
With points selected, the Curve group appears at the bottom of the tool rail.See the full screen
One point of the green leaf selected, which brings up the Curve group.
One point of the green leaf selected, which brings up the Curve group.See the full screen
No Curve group showing? Nothing is selected. Marquee some points with Select Points and it slides into view.
Pro note
Select some points and three handy buttons appear. They are the fast way to shape a crowd at once.

4Peak: snap corners crisp

Peak forces the selected points into hard corners, so the line arrives and leaves at a sharp angle with no rounding. Use it for anything that should read as an edge: a jaw, a knuckle, the corner of a book, the point of a nose. Select the points that should be crisp, click Peak, and the softness vanishes into clean angles. It is the fastest way to give a shape structure and bite.

Peak made the hexagon's points hard corners.
Peak made the hexagon's points hard corners.See the full screen
A face is usually mostly Smooth with a few Peak points for the chin and nose. Corners in the right places make the soft parts read as soft.
Pro note
Peak is for the sharp bits: jaws, knuckles, the tip of a nose. One click and the fuzz turns to a fold.

5Smooth: round points fully

Smooth is the opposite of Peak: it rounds the selected points all the way, so the curve flows through them like water. Reach for it on cheeks, bellies, shoulders, clouds, and anything organic. Select the points along a soft stretch, click Smooth, and a jagged run melts into a graceful arc. Paired with Peak, these two cover almost every outline you will ever draw, hard here, soft there.

Smooth rounded the second shape's points fully.
Smooth rounded the second shape's points fully.See the full screen
Smooth four points arranged in a diamond and you get a clean circle. It is the tidiest way to make a perfect round shape by hand.
Pro note
Smooth turns a zigzag into a river. Cheeks, clouds, tummies, anything that should look gentle.

6Fewer points equals a smoother line

Here is the golden rule of vector: fewer points draw smoother lines. Every point is a place the curve is forced to pass through, so too many points introduce tiny wobbles the eye reads as lumps. A clean, sweeping curve often needs only three or four well-placed anchors, not twenty. If a line looks bumpy, the fix is almost never adding points, it is removing them.

The red line has thirty two points and wobbles with small lumps.
The red line has thirty two points and wobbles with small lumps.See the full screen
The green curve, on only a few points, runs smooth.
The green curve, on only a few points, runs smooth.See the full screen
When a curve fights you, count its points. If there are more than the shape needs, that is your bumpiness, guaranteed.
Pro note
The urge to add just one more point is a trap. The smoothest lines are always the ones with the fewest posts.

7Simplify: thin a crowded line

Simplify is the cure for too many points. Select a crowded stretch of outline, click Simplify, and it drops the points that barely change the line, keeping only the ones doing real work. The curve stays the same shape but rides on far fewer anchors, which makes it smoother and much easier to rig. It is the tidy-up you will run after every Freehand stroke.

Simplify, in the Curve group, drops the points that barely change the line.
Simplify, in the Curve group, drops the points that barely change the line.See the full screen
Simplify is especially loving toward Freehand lines, which always arrive over-stuffed with points. One click after a fast scribble and it reads clean.
Pro note
Draw messy, then Simplify. It drops all the points that were not pulling their weight. Chef's kiss.

8Delete Point: remove one on purpose

Sometimes you want to remove a specific point rather than let Simplify decide. Delete Point takes out the exact anchor you target, and the curve re-flows through its neighbours to close the gap. Use it to kill a stray point that Freehand left behind, or to open up a run that is too tightly packed. It is precise where Simplify is automatic, so keep both in your kit.

Delete Point on the crowded red line: click a stray point to remove it.
Delete Point on the crowded red line: click a stray point to remove it.See the full screen
Deleting a point changes the curve on both sides of it, so glance at the whole neighbourhood after, not just the spot you clicked.
Pro note
Simplify is the bulk broom, Delete Point is the tweezers. Use tweezers when you know the exact troublemaker.

9Translate Points: move the selection

Shaping is not only about roundness, it is about position too. Translate Points drags your selected points to a new spot, carrying their curves along, so you can slide a mouth corner outward or lift a whole eyebrow. It is the workhorse for correcting proportion after the curves already look right. Move a little, look, move a little more, until the outline sits exactly where the reference says it should.

Translate Points moved the first eyebrow's selected points along the bottom row.
Translate Points moved the first eyebrow's selected points along the bottom row.See the full screen
Nudging a single point often fixes a lump faster than any curve tool, because sometimes the shape is right and the point is just in the wrong place.
Pro note
Curves handle the bend, Translate handles the where. Half of good editing is just sliding a point half a hair over.

10Scale Points: resize a whole selection

The transform tools reshape a group of points together, and the first is Scale Points. Select a cluster and drag to grow or shrink the whole selection around its centre, keeping every proportion intact. Use it to make an eye bigger, to shrink a hand that came out too large, or to size one shape to match another. Because it moves many points at once by the same ratio, the curves keep their character while the whole thing resizes.

Scale Points: the second eyebrow is the first one scaled larger.
Scale Points: the second eyebrow is the first one scaled larger.See the full screen
Scaling points is not the same as scaling the layer. This resizes the drawn shape itself inside the artwork, which is what you want when a body part is simply the wrong size.
Pro note
Eye too small? Select it and Scale Points. It grows the whole thing evenly without you redrawing a single curve.

11Rotate Points: spin a selection

Rotate Points turns your selected points around their centre. Grab a cluster and drag to spin it, which is how you tilt an ear, angle a hat, or cock an eyebrow without redrawing it. Because it rotates every selected point together, the internal shape stays exactly the same while its orientation changes. It pairs beautifully with Scale Points when you need a feature both resized and re-angled.

Rotate Points: the third eyebrow is the same shape turned.
Rotate Points: the third eyebrow is the same shape turned.See the full screen
Select cleanly before you rotate. Catch a stray point from a neighbouring shape and it will swing along too, which can look very strange.
Pro note
Rotate Points tilts a whole feature at once. Angle the eyebrow, cock the hat, spin the ear. No redrawing required.

12Shear Points: lean a selection

Shear Points slants your selection, pushing the top one way and the bottom the other so an upright shape leans. It is the tool for adding a sense of motion or attitude: an italic tilt to lettering, a windblown lean to hair, a body that leans into a run. Select the points, drag to skew, and the shape keeps its size while gaining a diagonal push. A little shear reads as energy.

Shear Points: the fourth eyebrow is the same shape slanted.
Shear Points: the fourth eyebrow is the same shape slanted.See the full screen
Shear is subtle. A gentle lean says leaning into the wind, a heavy one says falling over, so drag with restraint.
Pro note
Shear is the lean tool. A touch of slant turns a standing shape into one that is going somewhere.

13Perspective Points: fake some depth

Perspective Points squeezes one side of your selection smaller than the other, so a flat shape appears to recede into the distance. It is how you make a sign angle away from the viewer, a floor tile lie down in space, or a box read as three-dimensional. Select the points, drag a corner, and the far edge tapers while the near edge stays full. It is a quick way to add depth to what is really a flat drawing.

Perspective Points tapered the blue rectangle so it narrows to the left.
Perspective Points tapered the blue rectangle so it narrows to the left.See the full screen
Perspective Points is for the drawn shape, not the camera. For real scene depth across layers you use parallax, but for a single object leaning back in space, this is the tool.
Pro note
Squeeze the far edge and a flat shape leans into the distance. Cheap, cheerful, and surprisingly convincing depth.

14A tidy editing pass, start to finish

This is the whole rhythm in order. Rough in your outline, then run Simplify to thin the clutter. Walk the points with Curvature, dragging up on the soft spots and down on the corners, or batch it with Smooth and Peak. Fix any stray anchors with Delete Point and Translate Points. Finally, resize or angle whole features with Scale, Rotate, Shear, and Perspective Points. That sequence turns any rough into a clean, confident line.

The finished shapes after a full pass: corners, round curves, smooth lines and transforms.
The finished shapes after a full pass: corners, round curves, smooth lines and transforms.See the full screen
Save the transforms for last. Scale, rotate, and shear are about placing a finished feature, so shape the curves before you start moving whole clusters around.
Pro note
Simplify, then shape, then place. Follow that order and even a scrappy rough comes out looking deliberate.

Shape a line end to end

One clean editing pass. Links into the app. Saved on this device.

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Editing questions

You almost certainly have too many points. Every point is a place the curve must pass through, so extra ones create little wobbles. Select the crowded stretch and run Simplify, then shape the handful that remain with Curvature. Fewer points is the whole secret to a smooth line.

Curvature is a fine dial you drag on one point, up to round and down to sharpen, giving you exact control over how round that point sits. Smooth is a one-click preset that rounds every selected point fully. Use Curvature for feel and Smooth for speed across a whole selection.

Use Peak on points that should be hard corners: a jaw, a knuckle, the tip of a nose, the corner of an object. Select those points and click Peak to snap them crisp. A shape usually needs a few Peak points to give the smooth parts something to contrast against.

Undo, then be more selective. Simplify drops points it judges redundant, so if it removed one that mattered, select a smaller stretch before running it, or use Delete Point to remove only the specific anchors you choose. You can also add the point back with Add Point.

Select all its points and use Scale Points, then drag to grow or shrink the whole selection around its centre. The curves keep their character while the feature resizes. Pair it with Rotate Points if the feature also needs re-angling.

Shear slants a selection, pushing top and bottom in opposite directions so an upright shape leans. It adds motion and attitude: an italic tilt, windblown hair, a body leaning into a run. Keep it gentle, since a heavy shear reads as falling over rather than leaning.

No. Perspective Points reshapes the selected drawn points so one edge tapers smaller, faking depth on a single flat shape like a sign or a box. Real scene depth across layers comes from parallax and the camera, but for one object leaning back in space, this tool is exactly right.

Simplify to thin, then shape with Curvature, Smooth, and Peak, then fix strays with Delete Point and Translate Points, and finally place whole features with Scale, Rotate, Shear, and Perspective Points. Shaping before transforming keeps the process calm and predictable.

Your lines have backbone now

You can round, sharpen, thin, and transform any outline until it reads exactly the way you pictured it. That is the craft that separates a rough from a real drawing. Next, turn those clean outlines into solid, coloured shapes and give them a proper style.