# Geometry¶

These modifiers have no mix nor influence settings, as they always completely apply to the strokes” geometry (like object modifiers do). They take the resulting two-dimensional strokes from the Freestyle line set and displace or deform them in various ways.

As with other modifier stacks in Blender, they are applied from top to bottom.

## 2D Offset¶

The 2D Offset modifier adds some two-dimensional offsets to the stroke backbone geometry. It has two sets of independent options/effects:

Start and End
These two options add the given amount of offset to the start (or end) point of the stroke, along the (2D) normal at those points. The effect is blended over the whole stroke, if you for example, set only Start to 50, the start of the stroke is offset 50 pixels along its normal, the middle of the stroke, 25 pixels along its own normal, and the end point is not moved.
X and Y
These two options simply add a constant horizontal and/or vertical offset to the whole stroke.

## 2D Transform¶

The 2D Transform modifier applies two-dimensional scaling and/or rotation to the stroke backbone geometry. Scale is applied before rotation.

Le centre (point pivot) de ces transformations 2D peut être :

Stroke Center
Le point médian du trait.
Stroke Start
Le point de début du trait.
Stroke End
Le point final du trait.
Stroke Point Parameter
Le facteur Stroke Point Parameter contrôle l’endroit du trait se trouve le point pivot (point de début si défini à 0.0 ; point final si défini à 1.0).
Absolute 2D Point

The Pivot X and Pivot Y allows you to define the position of the pivot point in the final render (from the bottom left corner).

Important

Actuellement, vous devez prendre en compte la taille de rendu réelle, à savoir la résolution et le pourcentage de la résolution.

Scale X and Scale Y
Les facteurs d’échelle, dans leurs axes respectifs.
Rotation Angle
L’angle de rotation.

## Backbone Stretcher¶

The Backbone Stretcher modifier stretches (adds some length to) the beginning and end of the stroke.

Backbone Length
Length to add to the strokes” ends.

## Bézier Curve¶

le modificateur Bézier Curve remplace le trait par son approximation Bézier.

Error
The maximum distance allowed between the new Bézier curve and the original stroke.

## Blueprint¶

The Blueprint modifier produces blueprint-like strokes using either circular, elliptical, or square contours. A blueprint here refers to those lines drawn at the beginning of free-hand drawing to capture the silhouette of objects with a simple shape such as circles, ellipses and squares.

Shape
Which base shapes to use for this blueprint: Circles, Ellipses or Squares.
Rounds
How many rounds are generated, as if the pen draws the same stroke several times (i.e. how many times the process is repeated).
For the Circles and Ellipses shapes. Adds some randomness to each round in the relevant aspect. Using more than one round with no randomness would be meaningless, as they would draw over each other exactly.
Backbone Length and Random Backbone
For the Squares shapes. The first adds some extra length to each edge of the generated squares (also affected by the second parameter). The second adds some randomness to the squares.

Note that the Min 2D Length feature from the Strokes settings is quite handy here, to avoid the noise generated by small strokes…

## Guiding Lines¶

Le modificateur Guiding Lines remplace un trait par une ligne droite connectant ses deux extrémités.

Offset
Offset the start and end points along the original stroke, before generating the new straight one.

This modifier will produce reasonable results when strokes are short enough, because shorter strokes are more likely to be well approximated by straight lines. Therefore, it is recommended to use this modifier together with one of the splitting options (by 2D angle or by 2D length) from the Strokes panel.

## Perlin Noise 1D¶

The Perlin Noise 1D modifier adds one-dimensional Perlin noise to the stroke. The curvilinear abscissa (value between 0 and 1 determined by a point’s position relative to the first and last point of a stroke) is used as the input to the noise function to generate noisy displacements.

This means that this modifier will give an identical result for two strokes with the same length and sampling interval.

Frequency
How dense the noise is (kind of a scale factor along the stroke).
Amplitude
How much the noise distorts the stroke in the Angle direction.
Seed
The seed of the random generator (the same seed over a stroke will always give the same result).
Octaves
Le « niveau de détail » du bruit.
Angle
Dans quelle direction le bruit est appliquée (0.0 est complètement horizontale).

## Perlin Noise 2D¶

Le modificateur Perlin Noise 2D ajoute un bruit Perlin unidimensionnel au trait. Le modificateur génère des déplacements bruités en utilisant des coordonnées 2D des sommets de traits comme entrée du générateur de bruit.

Its settings are exactly the same as the Perlin Noise 1D modifier.

## Polygonization¶

The Polygonization modifier simplifies strokes as much as possible (in other words, it transforms smooth strokes into jagged polylines).

Error
The maximum distance allowed between the new simplified stroke and the original one (the larger this value is, the more jagged/approximated the resulting polylines are).

## Sampling¶

Le modificateur Sampling modifie la définition, précision du trait, pour les modificateurs suivants.

Sampling
Plus la valeur est petite, plus les traits sont précis. Soyez prudent ; ds valeurs trop petites vont requérir une quantité considérable de temps et de mémoire pendant le rendu !

## Simplification¶

The Simplification modifier merges stroke vertices that lie close to one another, like the Decimate modifier for meshes.

Tolerance
Measure for how close points have to be to each other to be merged. A higher tolerance means more vertices are merged.

## Sinus Displacement¶

Le modificateur Sinus Displacement ajoute un déplacement horizontal au trait.

Wavelength
How wide the undulations are along the stroke.
Amplitude
How high the undulations are across the stroke.
Phase
Allows « offsetting » (« moving ») the undulations along the stroke.

## Spatial Noise¶

The Spatial Noise modifier adds some spatial noise to the stroke. Spatial noise displacements are added in the normal direction (i.e. the direction perpendicular to the tangent line) evaluated at each stroke vertex.

Amplitude
How much the noise distorts the stroke.
Scale
How wide the noise is along the stroke.
Octaves
Le niveau de détail du bruit.
Smooth
Quand l’option est activée, appliquer un peu de lissage par dessus le bruit généré.
Pure Random
Si l’option est désactivée, la valeur aléatoire nouvellement générée dépend de de la précédente ; autrement elles sont complètement indépendantes. La désactivation de cette option offre un bruit plus « consistant » sur un trait.

## Tip Remover¶

Le modificateur Tip Remover supprime une portion du trait à son début et à sa fin.

Tip Length
Longueur du trait à supprimer à ses deux extrémités.