LightStreakAsset

Remarks

Not bloom with a direction. Bloom is isotropic because the scatter it models is. A streak comes from an aperture that is not round: an anamorphic lens squeezes a wide image onto a normal frame with a cylindrical element, so what diffracts inside it is stretched along one axis. No radius of an isotropic blur is that shape.

⚠ Before the tonemap, beside LensFlareAsset. A streak is light arriving at the sensor and has to be able to blow out; after the curve it is a wash.

⚠ Threshold is in the source's units. In a physically lit frame that is cd/m² and nothing is near one, so the default of one streaks the floor — the same argument !Bloom's threshold makes, and the same failure if it is left alone.

Fields and properties (13)

• public string Name

  The node's name, for debug groups and for a human reading the file.

• public bool Enabled

  Whether the node runs.

• public string Source

  The linear HDR colour the streak is built from and added onto.

• public string Output

  The name the result is published under.

• public PixelFormat Format

  The format of the targets it declares.

• public float Scale

  The fraction of the frame the streak is built at.

• public float Threshold

  Luminance above which a pixel streaks, in the source's units.

• public int BlurPasses

  How many blur passes run, each reaching further than the last.

• public int Samples

  How many taps each side of the centre one blur pass takes.

• public Vector2 Direction

  The axis the smear runs along, in UV.

• public float Attenuation

  How fast a tap fades per texel of separation. Below one, or the streak never ends.

• public float Intensity

  How bright the finished streak is added back.

• public Vector3 Tint

  A tint on the streak, for the blue a coated anamorphic element is known for.

Used by (5)

• PostEffectFactoryVixen.Rendering.PostFx
• StandardFrameVixen.Rendering.PostFx
• StandardFrameTestsVixen.Rendering.PostFx.Tests
• TypeRegistrationVixen.Rendering.PostFx
• Vixen_Rendering_PostFx_LightStreakAssetSerializerVixen.Rendering.PostFx