More Polygon Modeling

smallarrows.GIF

Switch over to the Modeling section, choose from upper left, status line.
Make sure the select by object type button sobject.jpg  is selected in the status line near the top for all examples.

Mesh and Topology
poly

A polygon mesh object is made of polygons. The illustration above indicates the 4 polygons that make up the cube without a top or bottom. A polygon is a closed planer (flat) surface.

A list of data points for the polygon mesh above may appear as follows:
         List of vertices and their number.
          1) -1, 1, 0
          2) -1, 0, 0
          3) 0, 0, 0
          4) 0, 1, 0
          5) 0, 0, 1
          6) 0, 1, 1
          7) -1, 0, 0
          8) -1, 1, 0
          List of polygons and the vertices that construct them.
          1) 1, 2, 3, 4
          2) 1, 2, 7, 8
          3) 8, 7, 5, 6
          4) 5, 6, 4, 3



Drawing a Mesh
poly_draw
Use Mesh Tools->Create Polygon Tool to draw a polygon
     Draw counter clockwise in most cases. This insures the shape is not inside-out.
     Hit Enter when you are done creating the shape



Curve to Polygon Face

Start with a NURBS curve. Make sure the curve is closed, or the first point is on top of the last point. You can also add holes if you like.
Create->Curve Tools->CV Curve Tool
Select the curve
Select the Modeling section, hit F2 button on the keyboard, or choose from upper left, status line.
Choose Surfaces -> Bevel Plus ->option.jpg

Under Bevel tab:
Create bevel: Check At start and At end
Bevel width: 0
Bevel depth: 0
Create cap:
Check At start and At end

Under Output Options tab:|
Output geometry: Polygon
Tessellation method: Sampling
Under Sampling Controls:
Along extrusion: Section
Samples: 1
Along curve: Span
Samples: For Linear curve degree, set to 1, for Cubic curve degree, set to 3
Click Bevel

Right mouse over the front surface, select face, click the front surface
Select Edit Mesh->Extract
Delete the sides and back face



Bevel a NURBS Curve to make a poly object

bevel_plus
Choose Create->Curve Tools->CV Curve Tool->option.jpg
Click on Curve Degree 3 Cubic for rounded curves, use 1 Linear for straight curves.

Hit Enter button on the keyboard when you are finished.

Choose Curves->Open/Close Curves  to close

Add holes if you like. Draw them counter clockwise.

Select your curves. If drawn with holes, select outer curve first, then the inner curves to bevel with holes.
Choose Surfaces->Bevel Plus->option.jpg
     Select Convex Out
          Extrude distance:  .5
          Create cap: At start and At end

     Under the Output Options tab
          Output geometry: Polygons
          Along Extrusion, Samples: 1

Illustrator files can also be brought in to use with Bevel



Delete Face
poly_delete_face

Use the Right Mouse button over your polygon to bring up the mini menu to select faces
     Hit Delete
(This is a poly primitive Helix)



Delete Edge/Vertex
poly_delete_edge_vert
This is a great way to clear up extra polygons
Vertex cannot be deleted individually if it is on the edge.

Select the Edges
Edit Mesh->Delete Edge/Vertex  (under Edge) Control + Del keys
If Del key is used instead to delete edge, it will delete only the edge and the vertex will need to be removed manually.


Extrude
poly_extrude
Choose select by component type   scomponent.jpg and make sure the faces button  verticon.gif   is pushed in; this will allow you to select faces. Select the top face by clicking on the little square in the middle of the face.

Select Edit Mesh->Extrude
Click the red box at the end of the red arrow of the extrude manipulator to change to scale mode. Pick the box at the center of the manipulator and scale down the face a little.

Hit "g" to run Extrude again)
Click on the blue arrow and drag straight up

You may also use rotate to add extrusions.

Later try animating extrude for Game of Thrones title sequence effect. Any tool can be animated though construction history.



Split Polygon
poly_interactive_split
Select Mesh Tools->Multi-Cut Tool
Click on an edge and drag down until the point snaps to the midpoint of the segment then release. Now click on the opposing edge and drag down until the point snaps to the midpoint of the segment then release. Hit enter.  This adds 2 vertices, and an edge.



Fill Hole
Use Mesh->Fill Hole to fill in any holes
poly_fill_hole



Insert Edge Loop
poly_edge_loop
Select
Mesh Tools->Insert Edge Loop Tool
Click and drag to add new edges (and vertices)



Slide Edge
poly_slide_edge
Select Mesh Tools
->Slide Edge
Use the Right Mouse button to bring up the mini menu to select edges
Click or double click on an edge
Use the middle mouse button to slide along an axis



Append to Polygon
poly_append
Select
Mesh Tools->Append to Polygon Tool
Select an edge to start
Look at the arrows, select the next edge following the arrows
Keep selecting edges until you are finished
Hit Enter


Bevel
poly_bevel
Select
Edit Mesh->Bevel->option.jpg
This will add a bevel to an entire object or selected edges




Merge
Use Edit-Mesh->Merge->
option.jpg     (Open the dialogue window.)
This will cleanup redundant vertices
Make sure you threshold tolerance is not too large, otherwise you will lose faces.
poly_merge


Add Divisions
Select
Edit Mesh->Add Divisions->option.jpg
poly_add_divisions



Display Poly Counts
Select Display->Heads Up Display->Poly Count

poly_count



Any NURBS Tool can be used to create Polygons
poly_loft
Switch over to the Modeling section, choose from upper left, status line.
Draw a couple NURBs curves, Create->Curve Tools->CV Curve Tool
Select
Surfaces->Loft->option.jpg  
     Choose Polygons
     Choose Quads

     Choose Tessellation method: General
     Change U type to: Per span # of iso params
     Change V type to: Per span # of iso params
     Input Number U: 3   (If this is too jaggy, increase)
     Input Number V:  1
     Hit Apply