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26 Cards in this Set
- Front
- Back
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world coordinate system, application, or object coordinate system
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The user's coordinate system
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window/screen coordinates
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units on the display of raster devices such as CRT
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geometric primitives
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specified in the problem domain including points, line segments, polygons, curves, and surfaces
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basic OpenGL geometric primitives are specified by ....
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sets of vertices
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All OpenGL geometric primitives are variants of.....
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points
line segments triangular polygons |
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line segments
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finite sections of lines between two vertices
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GL_POINTS
GL_LINES GL_LINE_STRIP GL_LINE_LOOP |
- each vertex display atleast 1 pixel big
- draws successive pairs of individual segments - (polyline) successive vertices connected forming line strip - successive vertices connected forming closed polygon |
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polygon
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object that has a border line loop as well as a well-defined interior
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the performance of graphics systems is characterized by....
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the number of polygons per second that can be rendered
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simple polygon
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no two edges cross each other
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convex
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if all points on the line segment between any two points inside the object, or in its boundary, are inside the object
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only OpenGL polygons that OpenGL supports?
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triangles
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GL_TRIANGLES
GL_TRIANGLE_STRIP GL_TRIANGLE_FAN |
- each successive group of three vertices for a triangle
- each additional vertex is combined with the previous two vertices - one fixed point, with next two points determining triangles |
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triangulation
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given a list of vertices, generate triangles consistent with the polygon defined by the list
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Delaunay triangulation algorithm
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finds the best triangulation in the sense that if we consider the circle determined by any triangle, no other vertex lies in this circle
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tesselation
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divides a polygon into a polygonal mesh
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fonts
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families of typefaces of a particular style
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stroke text
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constructed as are other geometric objects
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raster text
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characters defined by rectangles of bits called bit blocks
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bit-block-transfer
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moves the block of bits using a single function call
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attributes
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properties that describe how an object should be rendered
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colors occupy wavelengths between....
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350 to 780 nm
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basic tenet of three color theory
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if two colors produce the same tristimulus values, then they are visually indistinguishable
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additive color
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primary color add together to give the perceived color
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complementary colors
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cyan, magenta, yellow
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RGB-color model
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separate buffers for red, green, and blue images
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