3D Modeling & Sketchup

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1 3D Modeling & Sketchup Lecture 118, Tuesday October 30th, 2014 SketchUp / SkechUp Pro Available to CS 410 students on Windows Machines in USB /30/14 Bruce A. Draper & J. Ross Beveridge

2 Sketchup History 10/30/14 Bruce A. Draper & J. Ross Beveridge Opening Move 10/30/14 Bruce A. Draper & J. Ross Beveridge

3 Templates 10/30/14 Bruce A. Draper & J. Ross Beveridge One Rectangular Face! Exact values in the Dimensions Box.! You will want to learn to enter values here. 10/30/14 Bruce A. Draper & J. Ross Beveridge

4 Export to.obj format 10/30/14 Bruce A. Draper & J. Ross Beveridge Export to.obj format! Note, this is why we use.obj files. 10/30/14 Bruce A. Draper & J. Ross Beveridge

5 When Exporting Consider! Do you export edges? (generally no)! Are you two faced? (depends)! How about only triangles?! This is particularly easy with rectangles.! May be helpful depeding upon your ray tracer design and what you implement.! We are not yet ready to say much about texture maps 10/30/14 Bruce A. Draper & J. Ross Beveridge Add Some Color 10/30/14 Bruce A. Draper & J. Ross Beveridge

6 Now, 7 things to learn! Canonical Views! Rotating Views! Zooming Views! Extruding a 2D shape to produce 3D shape! Selecting parts faces! Painting faces! Removing a face 10/30/14 Bruce A. Draper & J. Ross Beveridge A Perfect Cube 10/30/14 Bruce A. Draper & J. Ross Beveridge

7 Coloring A Face - How 10/30/14 Bruce A. Draper & J. Ross Beveridge Delete the Top Face 10/30/14 Bruce A. Draper & J. Ross Beveridge

8 Scaling 10/30/14 Bruce A. Draper & J. Ross Beveridge Moving an Object Pay close attention Direction of move is guessed It is indicated in color of axis Changing viewpoing will probably change the defaults 10/30/14 Bruce A. Draper & J. Ross Beveridge

9 Selection Parts and All 10/30/14 Bruce A. Draper & J. Ross Beveridge Cloning an Object! Hold down the option key while dragging 10/30/14 Bruce A. Draper & J. Ross Beveridge

10 Cloning Once, Why Not More Note the magic 2x 10/30/14 Bruce A. Draper & J. Ross Beveridge Make 5 Select 5 Repeat = 25 10/30/14 Bruce A. Draper & J. Ross Beveridge

11 Rotation This is Trickier 10/30/14 Bruce A. Draper & J. Ross Beveridge Stonehenge 10/30/14 Bruce A. Draper & J. Ross Beveridge

12 Stonehenge /30/14 Bruce A. Draper & J. Ross Beveridge Learning More 10/30/14 Bruce A. Draper & J. Ross Beveridge

13 Modeling Approach #1: Polygonal Meshes (review) Surface patch = a polygon in 3D! 3 or more vertices! Each vertex is an (x, y, z) triple! Vertices are supplied in order! Boundary goes from vertex #1 to vertex #2 to vertex #N, and back to vertex #1! All vertices must be co-planar! Polygon must be convex 10/30/14 Bruce A. Draper & J. Ross Beveridge 2014 Slide 25 Surfaces: Connected Polygons (review)! A mesh surface is then just a set of nonoverlapping polygons that share vertices and edges Triangle Strip Quad Mesh 10/30/14 Bruce A. Draper & J. Ross Beveridge 2014 Slide 26

14 Surfaces are generally not planar (review)! Although every polygon in the mesh must be! Patches form a locally linear approximation to curved surfaces 3D Model by Daniel Rypl at the Czech Technical University in Prague. 10/30/14 Bruce A. Draper & J. Ross Beveridge 2014 Slide 27 Approach #2: (CFG) Constructive Solid Geometry! Modeling language defines shape primitives! E.g. sphere, cube, pyramid,! Shapes can be transformed! Translation, Rotation, Scale,! Shapes manipulated as sets! Shapes can be added (A union B) together! Shapes can be intersected (A intersect B)! Shapes can be subtracted (A minus B) 10/30/14 Bruce A. Draper & J. Ross Beveridge 2014 Slide 28

15 For example Set Difference Intersection Union 10/30/14 Bruce A. Draper & J. Ross Beveridge 2014 Slide 29 Representing CSG! CSG exploits object oriented representations.! A Shape is a top-level object.! Each type of shape is a subclass! Spheres store an (x,y,z) center and radius.! Cubes store vertices.! All shapes implement transformation operators. 10/30/14 Bruce A. Draper & J. Ross Beveridge 2014 Slide 30

16 Approach #3: Splines! Splines combine 3D surface patches! Each surface is a 3 rd -order surface patch! Made from two 3 rd -order curves More on curves and surfaces around Thanksgiving. 10/30/14 Bruce A. Draper & J. Ross Beveridge 2014 Slide 31

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