CMSC427 Rendering polylines Points, polylines and polygons Points - - PowerPoint PPT Presentation

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CMSC427 Rendering polylines Points, polylines and polygons Points - - PowerPoint PPT Presentation

Mar 07, 2023 332 likes •455 views

CMSC427 Rendering polylines Points, polylines and polygons Points Polyline Polygon Polyline can be rendered as each Points, polylines and polygons hMps://processing.org/reference/beginShape_.html Points Polyline Polygon beginShape(POINTS);

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SLIDE 1

CMSC427 Rendering polylines

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SLIDE 2

Points, polylines and polygons

Points Polyline Polygon Polyline can be rendered as each

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SLIDE 3

Points, polylines and polygons

Points Polyline Polygon

beginShape(POINTS); vertex(30, 75); // v0 vertex(40, 20); // v1 vertex(50, 75); // v2 ... endShape(); noFill(); beginShape(); vertex(30, 75); // v0 vertex(40, 20); // v1 vertex(50, 75); // v2 ... endShape(); fill(255); beginShape(); vertex(30, 75); // v0 vertex(40, 20); // v1 vertex(50, 75); // v2 ... endShape(CLOSE); hMps://processing.org/reference/beginShape_.html

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SLIDE 4

OpenGL primitives (WebGL version)

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Triangle strips and efficiency Vertex in red is shared with how many triangles?

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SLIDE 6

Triangle strips and efficiency

beginShape(TRIANGLE_STRIP); vertex(30, 75); // v0 vertex(40, 20); // v1 vertex(50, 75); // v2 vertex(60, 20); // v3 vertex(70, 75); // v4 vertex(80, 20); // v5 vertex(90, 75); // v6 endShape(CLOSE); VerYces belonging to mulYple triangles not repeated.

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SLIDE 7

Order of vertices to triangle strip this polygon?

A B C D E F G H I

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SLIDE 8

Order of vertices to triangle strip this polygon?

A B C D E F G H I

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SLIDE 9

Order of vertices to triangle fan this polygon?

H A B C D E F G

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SLIDE 10
  • 1. Polylines can be rendered in mulYple ways,

from points to triangles to strips to fans.

  • 2. How to look up and use the beginShape()
  • pYons in Processing (or similar

mechanisms in OpenGL, WebGL, etc.)

  • 3. That strips and fans allow for efficient

transmission of verYces.

  • 4. How to order verYces to make a strip or

fan. What you should know after today

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SLIDE 11
  • Processing
  • hMps://processing.org
  • Example program TriStripLabeled.pde

Today’s resources