Difference between revisions of "Project SOP"

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|OPtype=project
 
|OPtype=project
 
|OPfamily=SOP
 
|OPfamily=SOP
|Parsummary=
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|Parsummary=The number of points to be computed on the spatial face between successive spans. A span is the line connecting two consecutive CVs on a polygon, or the arc between two breakpoints on a spline curve. The projection tends to become more accurate as the number of divisions increases.
 
|Parorder=3
 
|Parorder=3
 
|Parname=sdivs
 
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|OPtype=project
 
|OPtype=project
 
|OPfamily=SOP
 
|OPfamily=SOP
|Parsummary=
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|Parsummary=Controls the precision of the ray intersection with the surface. The ray is cast along the projection vector from every point of the 3-D curve.
 
|Parorder=4
 
|Parorder=4
 
|Parname=rtolerance
 
|Parname=rtolerance
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|OPtype=project
 
|OPtype=project
 
|OPfamily=SOP
 
|OPfamily=SOP
|Parsummary=
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|Parsummary=Controls the 2-D fitting precision and is typically less than 0.01.
 
|Parorder=5
 
|Parorder=5
 
|Parname=ftolerance
 
|Parname=ftolerance

Revision as of 10:37, 14 September 2017

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Summary
[edit]

The Project SOP creates curves on surface (also known as trim or profile curves) by projecting a 3D face onto a spline surface, much like a light casts a 2D shadow onto a 3D surface. There are two projection methods: along a vector, or by mapping the face directly onto the parametric space of the surface.

You will usually need a Trim SOP, Bridge SOP, or Profile SOP after a Project SOP. For example, in the case of a Trim SOP we might have:

TouchGeometry146.gif

Use a Trim SOP to cut a hole in the projected surface (as shown above).

Use a Bridge SOP to skin the profile curve to another profile curve.

Use a Profile SOP to extract the curve on surface or remap its position.

If you end up with a profile curve that is not visible, it may still exist. Confirm a profile curve's existence by clicking on the SOP's info pop-up (using middle-mouse button).

Additional Operations for Profile Curves

To delete a projected curve, use a Delete SOP, and enter the profile number (e.g. 1.4 returns the fifth profile on the second primitive (counting starts at 0) ). You can visualise the number of the profiles by enabling the Profile Number icon in the Viewport Display options.

You can group the profile curves with a Group SOP. Do this by typing the profile numbers in the Pattern field. You can use all regular expressions.

You can apply parametric affine transformations to the profile by using a Primitive SOP. You can also use the Primitive SOP to open, close, reverse, and cycle the profile curves.

Note: When applying transformations to a profile in the Primitive SOP, you can only rotate about the Z axis because the projected curve is a planar curve that lives in the domain of the surface. Therefore it wouldn't make any sense to allow rotations in X or Y for profiles.

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TouchDesigner Build:

SOPs
Add • Alembic • Align • Arm • Attribute Create • Attribute • Basis • Blend • Bone Group • Boolean • Box • Bridge • Cache • Cap • Capture Region • Capture • Carve • CHOP to • Circle • Clay • Clip • Convert • Copy • CPlusPlus • Creep • Curveclay • Curvesect • DAT to • Deform • Delete • Divide • Extrude • Facet • File In • Fillet • Fit • Font • Force • Fractal • Grid • Group • Hole • Import Select • In • Introduction To SOPs id • Inverse Curve • Iso Surface • Join • Joint • Kinect • Lattice • Limit • Line • Line Thick • LOD • LSystem • Magnet • Material • Merge • Metaball • Model • Noise • Null • Object Merge • Oculus Rift • OpenVR • Out • Particle • Point • Polyloft • Polypatch • Polyreduce • Polyspline • Polystitch • Primitive • Profile • Project • Rails • Raster • Ray • Rectangle • Refine • Resample • Revolve • Script • Select • Sequence Blend • Skin • Sort • Sphere • Spring • Sprite • Stitch • Subdivide • Superquad • Surfsect • Sweep • Switch • Text • Texture • Torus • Trace • Trail • Transform • Trim • Tristrip • Tube • Twist • Vertex • Wireframe • ZED

An Operator Family that reads, creates and modifies 3D polygons, curves, NURBS surfaces, spheres, meatballs and other 3D surface data.

A surface type in SOPs including polygon, curve (NURBS and Bezier), patch (NURBS and Bezier) and other shapes like sphere, tube, and metaball. Points and Primitives are part of the Geometry Detail, which is a part of a SOP.