# ParticleSystem.ShapeModule > Script interface for the ShapeModule. ## Definition * **Type:** Struct * **Namespace:** [UnityEngine](/engine/6000.6/script-reference/unityengine.md) * **Assembly:** UnityEngine.ParticleSystemModule ```csharp public struct ParticleSystem.ShapeModule ``` ## Remarks Configures the initial positions and directions of particles. Additional Resources: [ParticleSystem](/engine/6000.6/script-reference/unityengine/particlesystem.md), [ParticleSystem.shape](/engine/6000.6/script-reference/unityengine/particlesystem/shape.md). ## Properties | Property | Description | | -------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------- | | [alignToDirection](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/aligntodirection.md) | Align particles based on their initial direction of travel. | | [angle](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/angle.md) | Angle of the cone to emit particles from. | | [arc](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/arc.md) | Angle of the circle arc to emit particles from. | | [arcMode](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/arcmode.md) | The mode that Unity uses to generate particles around the arc. | | [arcSpeed](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/arcspeed.md) | In animated modes, this determines how quickly the particle emission position moves around the arc. | | [arcSpeedMultiplier](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/arcspeedmultiplier.md) | A multiplier of the arc speed of the particle emission shape. | | [arcSpread](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/arcspread.md) | Control the gap between particle emission points around the arc. | | [boxThickness](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/boxthickness.md) | Thickness of the box to emit particles from. | | [donutRadius](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/donutradius.md) | The thickness of the Donut shape to emit particles from. | | [enabled](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/enabled.md) | Specifies whether the ShapeModule is enabled or disabled. | | [length](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/length.md) | Length of the cone to emit particles from. | | [mesh](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/mesh.md) | Mesh to emit particles from. | | [meshMaterialIndex](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/meshmaterialindex.md) | Emit particles from a single Material of a Mesh. | | [meshRenderer](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/meshrenderer.md) | MeshRenderer to emit particles from. | | [meshShapeType](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/meshshapetype.md) | Where on the Mesh to emit particles from. | | [meshSpawnMode](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/meshspawnmode.md) | The mode to use to generate particles on a Mesh. | | [meshSpawnSpeed](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/meshspawnspeed.md) | In animated modes, this determines how quickly the particle emission position moves across the Mesh. | | [meshSpawnSpeedMultiplier](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/meshspawnspeedmultiplier.md) | A multiplier of the Mesh spawn speed. | | [meshSpawnSpread](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/meshspawnspread.md) | Control the gap between particle emission points across the Mesh. | | [normalOffset](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/normaloffset.md) | Move particles away from the surface of the source Mesh. | | [position](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/position.md) | Apply an offset to the position from which the system emits particles. | | [radius](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/radius.md) | Radius of the shape to emit particles from. | | [radiusMode](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/radiusmode.md) | The mode to use to generate particles along the radius. | | [radiusSpeed](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/radiusspeed.md) | In animated modes, this determines how quickly the particle emission position moves along the radius. | | [radiusSpeedMultiplier](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/radiusspeedmultiplier.md) | A multiplier of the radius speed of the particle emission shape. | | [radiusSpread](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/radiusspread.md) | Control the gap between particle emission points along the radius. | | [radiusThickness](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/radiusthickness.md) | Radius thickness of the shape's edge from which to emit particles. | | [randomDirectionAmount](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/randomdirectionamount.md) | Randomizes the starting direction of particles. | | [randomPositionAmount](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/randompositionamount.md) | Randomizes the starting position of particles. | | [rotation](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/rotation.md) | Apply a rotation to the shape from which the system emits particles. | | [scale](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/scale.md) | Apply scale to the shape from which the system emits particles. | | [shapeType](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/shapetype.md) | The type of shape to emit particles from. | | [skinnedMeshRenderer](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/skinnedmeshrenderer.md) | SkinnedMeshRenderer to emit particles from. | | [sphericalDirectionAmount](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/sphericaldirectionamount.md) | Makes particles move in a spherical direction from their starting point. | | [sprite](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/sprite.md) | Sprite to emit particles from. | | [spriteRenderer](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/spriterenderer.md) | SpriteRenderer to emit particles from. | | [texture](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/texture.md) | Specifies a Texture to tint the particle's start colors. | | [textureAlphaAffectsParticles](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/texturealphaaffectsparticles.md) | When enabled, the system applies the alpha channel of the Texture to the particle alpha when the particle spawns. | | [textureBilinearFiltering](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/texturebilinearfiltering.md) | When enabled, the system takes four neighboring samples from the Texture then combines them to give the final particle value. | | [textureClipChannel](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/textureclipchannel.md) | Selects which channel of the Texture to use for discarding particles. | | [textureClipThreshold](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/textureclipthreshold.md) | Discards particles when they spawn on an area of the Texture with a value lower than this threshold. | | [textureColorAffectsParticles](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/texturecoloraffectsparticles.md) | When enabled, the system applies the RGB channels of the Texture to the particle color when the particle spawns. | | [textureUVChannel](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/textureuvchannel.md) | When using a Mesh as a source shape type, this option controls which UV channel on the Mesh to use for reading the source Texture. | | [useMeshColors](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/usemeshcolors.md) | Modulate the particle colors with the vertex colors, or the Material color if no vertex colors exist. | | [useMeshMaterialIndex](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/usemeshmaterialindex.md) | Emit particles from a single Material, or the whole Mesh. |