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  2. Limit SOP

    Limit SOP

    Summary

    The Limit SOP creates geometry from samples fed to it by CHOPs. It creates geometry at every point in the sample. Different types of geometry can be created using the Output Type parameter on the Channels Page.

    PythonIcon.pnglimitSOP_Class


    Parameters - Channels Page

    CHOP chop - Specifies which CHOP Network / CHOP contains the sample data to fetch.

    Rotate Order rord - ⊞ - Specifies the order in which the Rotate Channel X / Y / Z channels are applied.
    • Rx Ry Rz xyz -
    • Rx Rz Ry xzy -
    • Ry Rx Rz yxz -
    • Ry Rz Rx yzx -
    • Rz Rx Ry zxy -
    • Rz Ry Rx zyx -

    X Channel chanx - Channels used to specify the point's positions, tx.

    Y Channel chany - Channels used to specify the point's positions, ty.

    Z Channel chanz - Channels used to specify the point's positions, tz.

    Rotate Channel X chanrx - Channels used to specify the rotational data of the geomtery created at each point. Only used when Output Type is "Polygon at Each Point" or "Primitive Circle at Each Point".

    Rotate Channel Y chanry - Channels used to specify the rotational data of the geomtery created at each point. Only used when Output Type is "Polygon at Each Point" or "Primitive Circle at Each Point".

    Rotate Channel Z chanrz - Channels used to specify the rotational data of the geomtery created at each point. Only used when Output Type is "Polygon at Each Point" or "Primitive Circle at Each Point".

    Radius Channel chanrad - Uniformly controls the radius of the geometry created at each point. The Radius channels are multiplied with the Radius parameter on the Output Page.

    Radius Channel X chanradx - Channels that control the radius on the respective axis. The Radius channels are multiplied with the Radius parameter on the Output Page.

    Radius Channel Y chanrady - Channels that control the radius on the respective axis. The Radius channels are multiplied with the Radius parameter on the Output Page.

    Radius Channel Z chanradz - Channels that control the radius on the respective axis. The Radius channels are multiplied with the Radius parameter on the Output Page.

    Alpha Channel chanalpha - Controls the point alpha, giving you alpha control of any geometry created at those points.

    Note: If using a Copy SOP, turn on the Use Template Point Attributes option in the Copy SOP's Attributes Page to allow the geometry to inherit the point attributes.

    Red Channel chanr - These channels control the point color, or the color of any geometry created at those points.

    Green Channel chang - These channels control the point color, or the color of any geometry created at those points.

    Blue Channel chanb - These channels control the point color, or the color of any geometry created at those points.

    Texture W texturew - Controls the w texture-offset for the point(s) This is most often used as a frame-offset or time-offset, expressed in # of frames from the current frame or frame 1 of an image sequence.


    Parameters - Custom Page

    Allows custom attributes to be added to the geometry created. Use the + button to add additional parameters to add more custom attributes.

    Custom Attribute customattr - Sequence of custom attributes to be added to the geometry created.
    Name customattr0name - Specify the name of the custom attribute, for example pscale, age, or any custom name.

    Channel Zero customattr0chan0 - Select which channel to assign to the [0] index of the attribute. ie. pscale[0]

    Channel One customattr0chan1 - Select which channel to assign to the [1] index of the attribute. ie. pscale[1]

    Channel Two customattr0chan2 - Select which channel to assign to the [2] index of the attribute. ie. pscale[2]

    Channel Three customattr0chan3 - Select which channel to assign to the [3] index of the attribute. ie. pscale[3]


    Parameters - Output Page

    Output Type output - ⊞ - The type of geometry the Limit SOP produces from its sample data.
    • Polygonal Line line - Creates a point for each sample and connects them with a polygonal line.
    • Polygon at Each Point polys - Places a polygon at each sample point. Number of points in polygon defined by Divisions.
    • Primitive Circle at Each Point circles - Places a primitive circle at each sample point.
    • Sphere at Each Point spheres - Places a primitive sphere at each smaple point.
    • Poly Sphere at Each Point polyspheres - Places a polygonal sphere at each sample point. Sphere's frequency defined by Divisions.
    • Tubes tubes - Creates a tube down the path. Tubes cross-section defined by Divisions.
    • Strips strips - Creates a strip down the path. Number of points in strip defined by Divisions.

    Divisions divisions - Only works on the following Output Types.
    • Polygon at Each Point - Number of points per polygon.
    • Poly Sphere at Each Point - Frequency of each Polygonal Sphere.
    • Tubes - Number of points in cross-section of the tube.
    • Strips - Number of points in cross-section of the strip.

    Radius rad - Radius of geometry created. Disabled for "Polygonal Line".

    Smooth Flip flipsmooth - Dynamically controls the twist of each instance of geometry on a series of points to avoid frame-by-frame flipping, which can sometimes occur when geometry is oriented along a path.

    Limit dolimit - ⊞ - Creates a bounding box for the position of the output geometry. Drop down menu determines behavior when outside bounded region.
    • Off off - Bounding region off.
    • Clamp clamp - Clamps position to specified value.
    • Loop loop - Loops position between bounded region.
    • Zigzag zigzag - Zigzags position back and forth between bounded region.

    X Limit xlimit - ⊞ - Parameters to set edges of bounding region when Limit is active.
    • xlimitmin -
    • xlimitmax -

    Y Limit ylimit - ⊞ - Parameters to set edges of bounding region when Limit is active.
    • ylimitmin -
    • ylimitmax -

    Z Limit zlimit - ⊞ - Parameters to set edges of bounding region when Limit is active.
    • zlimitmin -
    • zlimitmax -

    Apply Texture texture - Applys u, v, and w texture coordinates to the created geometry.

    Scale texscale - ⊞ - Scales the texture coordinates a specific amount.
    • texscale1 -
    • texscale2 -

    Offset texoffset - ⊞ - Offsets the texture coordinates a specific amount.
    • texoffset1 -
    • texoffset2 -

    Orient to Path orient - If this option is selected, the object will be oriented along the path. To see what the path looks like, change the Output Type to "Polygonal Line". When the Output Type is "Polygon/Primitive Circle at Each Point", the positive Z axis of each object will be pointing down the path. When the Output Type is "Tubes/Strips" then the cross-section of the geometry created will be pointing down the path.

    Lookat Object lookat - Orient to Path must be checked for Lookat Object to have any effect. This allows you to orient your geometry by naming the object you would like it to Look At, or point to. Once you have designated this object to look at, it will continue to face that object, even if you move it. The Look At parameter points the each piece of geometry at the other object's origin individually.

    Rotate Polys dorotate - ⊞ - Rotate the geometry at each point using the Rotate parameter (below). Only works for Output Type is "Polygon/Primitive Circle at Each Point".
    • Off off - Do not rotate polys. Rotate parameter is greyed out.
    • On on - Add value of Rotate to polys equally.
    • Cumulative cum - Add value of Rotate to polys cumulatively (ie. increasing with each poly).

    Rotate rotate - ⊞ - Rotation channels rx, ry, and rz for Rotate Polys parameter.
    • X rotatex -
    • Y rotatey -
    • Z rotatez -

    Compute Normals normals - Computes normals for the geometry created.


    Info CHOP Channels

    Extra Information for the Limit SOP can be accessed via an Info CHOP.

    Common SOP Info Channels

    • num_points - Number of points in this SOP.
    • num_prims - Number of primitives in this SOP.
    • num_particles - Number of particles in this SOP.
    • last_vbo_update_time - Time spent in another thread updating geometry data on the GPU from the SOP's CPU data. As it is part of another thread, this time is not part of the usual frame time.
    • last_meta_vbo_update_time - Time spent in another thread updating meta surface geometry data (such as metaballs or nurbs) on the GPU from the SOP's CPU data. As it is part of another thread, this time is not part of the usual frame time.

    Common Operator Info Channels

    • total_cooks - Number of times the operator has cooked since the process started.
    • cook_time - Duration of the last cook in milliseconds.
    • cook_frame - Frame number when this operator was last cooked relative to the component timeline.
    • cook_abs_frame - Frame number when this operator was last cooked relative to the absolute time.
    • cook_start_time - Time in milliseconds at which the operator started cooking in the frame it was cooked.
    • cook_end_time - Time in milliseconds at which the operator finished cooking in the frame it was cooked.
    • cooked_this_frame - 1 if operator was cooked this frame.
    • warnings - Number of warnings in this operator if any.
    • errors - Number of errors in this operator if any.


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