Livello Contorno

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Layer geometry outline icon.png

Relativamente ai Livelli Contorno

I Livelli Contorno sono usati per evidenziare tratti o bordi di forme piene. I contorni danno un aspetto di cartone animato quando associati ai bordi delle forme. Anche i soli contorni (pennellate) sono usati per definire pieghe di disegni 3D ed usati assieme alle ombre (generate usando gradienti di sfumatura) sono le basi del lavoro di un artista.

Per generare un Livello Contorno, usa lo Strumento Contorno e spunta la casella Contorno nel Pannello Opzioni Strumenti. Una volta terminata la definizione della geometria del contorno e dopo aver premuto "Genera Linea Bézier (BLine) e/o Regione" (o selezionato un'altro strumento o stato) viene generato il Livello Contorno con l'attuale colore di primo piano.

Parametri dei Livelli Contorno

I parametri dei Livelli Contorno sono:

Nome Valore Tipo
Type real icon.png Profondità Z 0.000000 reale
Type real icon.png Valore 1.000000 reale
Type integer icon.png Metodo Miscela Composite intero
Type color icon.png Colore
Type vector icon.png Origine 0.000000u,0.000000u vettore
Type bool icon.png Inverti
Type bool icon.png Antiscalettatura
Type real icon.png Sfumatura 0.000000pt reale
Type integer icon.png Tipo di Sfumatura Sfocatura Gaussiana Veloce intero
Type integer icon.png Stile Serpentina Non Zero intero
Type list icon.png Vertici Lista lista (BLinea)
Type real icon.png Ampiezza Contorno 2.000000pt reale
Type real icon.png Espansione 0.000000pt reale
Type bool icon.png Punte Accuminate
Type bool icon.png Inizio Arrotondato
Type bool icon.png Fine Arrotondata
Type real icon.png Ciclo Continuo 1.000000 reale
Type bool icon.png Omogeneo

Parametri specifici per i Livelli Contorno

The first 11 parameters of the Outline are common parameter that are shared for several types of Layers. Click on the links to see their definitions. Only the particular parameters for the Outline Layer are described here.

This is a sample screen shot of an Outline Layer in action:


Outline width

The Outline width parameter is a float value in pixels that represents the basic value of the width for all the points of the curve at the same time. It works together with the width parameter of the vertices' child values. So setting the Outline Width to 1.0px then the resulting value for the rendered width in that vertex comes from this formula: W = OLW * VW + 2E.


  • W = resulting width of the outline at that vertex.
  • OLW = overall parameter for the width of all the vertices (that is the Outline Width parameter).
  • VW = specific vertex width value.
  • E = value of the Expand parameter.

The width duck would show the radius value for that vertex (W/2).

The width that ends up being used for each vertex is ((VertexWidth * OutLineWidth) + Expand*2):

Image:Outline-default.png Image:Outline-outline-width.png
starting image after doubling the value of 'outline width'

It's possible to specify negative values for the width values, which kind of turns the vertex inside out. Here's an example where the left vertex has a negative width and the right has a positive width. Note how the edges of the bline between the vertices cross each other in the middle:

Image:Outline-negative-width.png Image:Outline-negative-width-selected.png


The Expand parameter is similar to the Outline Width parameter, but rather than being multiplied by each vertex's width, it is added to the radius of each vertex. In other words (2*Expand) is added to the diameter of each vertex.

The width that ends up being used for each vertex is ((VertexWidth * OutLineWidth) + Expand*2):

Image:Outline-default.png Image:Outline-expand.png
zero 'expand' non-zero 'expand'

Sharp cups

Enabling 'sharp cusps' makes the corners pointy when the tangents are split:

Image:Outline-default.png Image:Outline-sharp-cusps.png
no sharp cusps sharp cusps

Rounded Begin

Enabling 'rounded begin' makes the start of the outline rounded:

Image:Outline-default.png Image:Outline-rounded-begin.png
no rounded begin rounded begin

Rounded End

Enabling 'rounded end' makes the end of the outline rounded:

Image:Outline-default.png Image:Outline-rounded-end.png
no rounded end rounded end


This parameter currently does absolutely nothing at all!


Enabling 'Homogeneous' changes the way that the width of the outline changes from one blinepoint to the next. Each point in the bline has its own width, and the bline has its own 'Outline Width' and 'Expand' parameters which are used to give the final width at each blinepoint. The 'Homogeneous' parameter controls how the width is interpolated between two neighbouring blinepoints:

  • When 'Homogeneous' isn't checked, the width is interpolated linearly with the spline's 't' parameter.
  • When 'Homogeneous' is checked, the width is interpolated linearly with the spline's length.

Turning off homogeneous often makes the fat end of a bline look lumpy. Maybe that's a bug:

Image:Outline-not-homogeneous.png Image:Outline-homogeneous.png
not homogeneous homogeneous


The 'antialias' checkbox isn't specific to the Outline layer, but it is particularly useful for the Outline layer. It makes the edges appear smoother:

Image:Outline-no-antialias.png Image:Outline-default.png
not antialiased antialiased

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