VfxOpcode

Remarks

Deliberately a small, closed set of coarse operations rather than a general expression language. A node graph could be lowered to add/multiply/select and a register file, and then both backends would need a register allocator; lowering to "apply gravity" instead means the CPU backend is a loop and the GPU backend is a line of shader source. The cost is that a genuinely novel node needs an opcode here — which is the right cost to pay while the node library is small enough to enumerate.

Fields and properties (25)

• SetPosition

  Position is a fixed point. A.xyz is the point.

• PositionInSphere

  Position is uniform inside a sphere. A.xyz is the centre, A.w the radius.

• PositionInBox

  Position is uniform inside a box. A.xyz is the minimum, B.xyz the maximum.

• SetVelocity

  Velocity is a fixed vector. A.xyz is it.

• VelocityRandomDirection

  Velocity is a random direction at a random speed. A.x and A.y are the speed range.

• VelocityInCone

  Velocity is inside a cone. A.xyz is the axis, A.w the half-angle in radians, B.x and B.y the speed range.

• SetLifetime

  Lifetime is uniform in a range. A.x and A.y are it.

• SetSize

  Size is uniform in a range. A.x and A.y are it.

• SetColour

  Colour is fixed. A is it, linear RGBA.

• SetRotation

  Roll is uniform in a range. A.x and A.y are it, in radians.

• SetAngularVelocity

  Angular velocity is uniform in a range. A.x and A.y are it.

• Integrate

  Position moves by velocity. No parameters.

• Gravity

  Velocity gains an acceleration. A.xyz is it, per second squared.

• Drag

  Velocity decays. A.x is the coefficient, per second.

• Rotate

  Roll advances by angular velocity. No parameters.

• SizeOverLife

  Size follows age. A.x is the size at birth, A.y at death.

• ColourOverLife

  Colour follows age. A is the colour at birth, B at death.

• Attract

  Velocity is pulled towards a point, or pushed from it. A.xyz is the point, A.w the acceleration at the centre — negative repels — and B.x the radius beyond which it does nothing. A radius of zero or less reaches everywhere and does not fall off.

• Vortex

  Velocity is turned about an axis. A.xyz is a point on the axis, A.w the acceleration, B.xyz the axis, and B.w the radius beyond which it does nothing.

• Turbulence

  Velocity is pushed by curl noise. A.xyz is the frequency, A.w the acceleration, B.x how fast the field drifts, and B.y how many octaves.

• CollidePlane

  Particles are kept on the front side of a plane. A.xyz is the unit normal, A.w the plane's distance along it from the origin, B.x how much of the approach speed survives the bounce, and B.y how much of the sliding speed is lost to friction.

• CollideSphere

  Particles are kept outside a sphere. A.xyz is the centre, A.w the radius, B.x the bounce and B.y the friction.

• SetCustom

  A custom attribute is a fixed value. Slot says which, and A is the value — as many lanes as the slot was declared with.

• RandomCustom

  A custom attribute is uniform between two values, lane by lane. A is the low end and B the high one.

• CustomOverLife

  A custom attribute follows age. A is the value at birth, B at death.

Used by (43, showing 40)

• SweepBenchmarksVixen.Benchmarks.Vfx
• ParticleLightTestsVixen.Rendering.Tests
• ParticleRenderFeatureTestsVixen.Rendering.Tests
• ParticleSpriteDeviceTestsVixen.Graphics.Golden.Tests
• SourceVixen.Rendering.Tests
• TypeRegistrationVixen.Rendering
• VfxAgreementTestsVixen.Vfx.Gpu.Tests
• VfxCollisionTestsVixen.Vfx.Tests
• VfxCompiledGraphTestsVixen.Vfx.Tests
• VfxCustomAttributeTestsVixen.Vfx.Tests
• VfxEffectContentTestsVixen.Rendering.Tests
• VfxForceTestsVixen.Vfx.Tests
• VfxGeometryTestsVixen.Vfx.Tests
• VfxOpcodesVixen.Vfx
• VfxOperationVixen.Vfx
• VfxOperationRowVixen.Rendering
• VfxParallelTestsVixen.Vfx.Tests
• VfxReapTestsVixen.Vfx.Gpu.Tests
• VfxRibbonTestsVixen.Vfx.Tests
• VfxShaderEmitterVixen.Vfx
• VfxShaderEmitterTestsVixen.Vfx.Tests
• VfxShaderUniformTestsVixen.Vfx.Tests
• VfxSimulationVixen.Vfx
• VfxSortTestsVixen.Vfx.Gpu.Tests
• VfxSubEmitterTestsVixen.Vfx.Tests
• VfxSystemTestsVixen.Vfx.Tests
• Vixen_Rendering_Vfx_VfxOperationRowSerializerVixen.Rendering
• AttractNodeVixen.Editor.VfxGraph
• CollidePlaneNodeVixen.Editor.VfxGraph
• ColourNodeVixen.Editor.VfxGraph
• ColourOverLifeNodeVixen.Editor.VfxGraph
• DragNodeVixen.Editor.VfxGraph
• GravityNodeVixen.Editor.VfxGraph
• IntegrateNodeVixen.Editor.VfxGraph
• LifetimeNodeVixen.Editor.VfxGraph
• PositionInBoxNodeVixen.Editor.VfxGraph
• PositionInSphereNodeVixen.Editor.VfxGraph
• RandomVelocityNodeVixen.Editor.VfxGraph
• SetVelocityNodeVixen.Editor.VfxGraph
• SizeNodeVixen.Editor.VfxGraph