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Free Houdini tutorials and List of all Houdini attributes and its usage
Houdini Attributes List with simplified EXPLANATION
▾ Point and primitives attributes
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- @P vector – Point position.
- @N vector – Normal direction.
- @v vector – Velocity of points.
- @id int – Unique element ID.
- @ptnum int – The point number.
- @name string – Find obj in code by name.
- @numpt int – Total number of points.
- @piece int – Faces in the same piece will share the same value in their piece attribute.
- @Time float – Current time, in seconds.
- @Frame int – Current frame.
- @primnum int – The primitive number.
- @numprim int – The total number of primitives.
- @scale vector uniformly along each axis separately
- @up vector – Up vector of the copy (+Y axis of the copy, if no p@orient).
- @rot quaternion– Additional rotation (applied after the orientation attributes above).
- @trans vector – Translation of the copy, in addition to v@P.
- @pivot vector – Local pivot point for the copy.
- @transform matrix – Transform matrix overriding everything except v@P, v@pivot, and trans.
- @shop_materialpath string – The instanced object uses this material
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2► Volume bind attributes
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- @P vector – Position of the current voxel.
- @density float – Density field at the current voxel location.
- @center vector – Center of the current volume.
- @dPdx, @dPdy, @dPdz vector –Vectors store the change in P that occurs in the x, y, and z voxel indices.
- @ix, @iy, @iz int – Voxel indices. For dense volumes (non-VDB) these range from 0 to resolution-1.
- @resx, @resy, @resz int – Resolution of the current volume.
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6► Houdini attributes list of particle system
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▾ Particle Birth Attributes
- @age float -Time particle was born.
- @life float – Time particle is allowed to live.
- @nage float – Normalized age, age divided by life.
- @dead int – To kill particles.
- @id int – A unique id for the particle.
▾ Particle collision Attributes
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- @stopped int – Put particle in rest.
- @stuck int – Stick a particle to surface.
- @sliding int – Sliding along a surface.
- @cling float – Applied to sliding particles inwards.
- @pospath string – The path to the object the particle is colliding.
- @posprim int – Collision primitive in the path geometry position.
- @posuv vector – Parametric uv on the collision primitive.
- @hittotal int – The cumulative total of all hits for the particle.
- @has_pprevious int – 1 if @pprevious contains valid values.
- @pprevious vector – Position of the particle on the previous frame
- @hitnum int – Number of times the particle collided.
- @hitpath string – Path to the object that was hit
- @hitprim int – primitive hit by particles.
- @hituv vector – Parametric UV space on the primitive.
- @hitpos vector – Position hit actually occurred with colliding object .
- @hitnml vector – Normal of the surface at the time of the collision.
- @hitv vector – Velocity of the surface at the time of the collision.
- @hittime float -Time when the collision occurred.
- @hitimpulse float – Records an impulse for the collision resolution.
- @bounce float – Particles bounce energy they keep.
- @bounceforward float – Particles energy they keep in the tangential direction.
- @friction float – Particles slowed down proportional over the time.
- @collisionignore string -Objects that match this pattern will not be collided.
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▾ Particle movement Attributes
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- @force float -Forces on the particle for this frame.
- @mass float – Inertia of the particle.
- @spinshape vector – Shape of the particle for rotational inertia.
- @drag float – Particle is effected by any wind effects.
- @dragexp float – Angular and linear drag.
- @dragshape vector – Particle is dragged in each of its local axes.
- @dragcenter vector – Drag forces will also generate torques on the particle.
- @targetv vector – Goal, or target, velocity for the particle.
- @airresist float – Resist hickness of the air.
- @speedmin float – Minimum speed a particle can move.
- @speedmax float – Maximum speed a particle can move
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Contrary to popular belief, Lorem Ipsum is not simply random text. It has roots in a piece of classical Latin literature from 45 BC, making it over 2000 years old.