cg8_2013 - Computer Graphics Lecture 8 Antialiasing Texture...

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&omputer *raphics /ecture ± $ntialiasing² 7exture 0apping
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7oday 7exture mapping • $ntialiasing • $ntialiasing³textures
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7exture 0apping :hy needed" • $dding details using high resolution polygon meshes is costly • 1ot very suitable for real³time applications TKb_`b DS_VST[RO $^UR[RO $^UR±S\YZ\ZQZWXS[XY
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7exture mapping´ • 0ethod of improving surface appearance by mapping images onto the surface • 'one at the rasterization stage
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3rinciples of 7exture 0apping )or each triangle in the model² establish a corresponding region in the texture image ,mage has much higher resolution than mesh 'uring the rasterization² color the surface by that of the texture 89 coordinates the µ' coordinates of the texture map
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,nterpolating the uv coordinates • 7o compute the 89 inside the triangle² interpolate those at the vertices • 'one at the rasterization stage • 8se barycentric coordinates u# α u · β u µ · γ u ¸ v # α v · β v µ · γ v ¸
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1.What is the color of the 3 vertices of the triangle? 2.!How will the textured triangle look like?
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!How to Produce a UV Mapping? • 8se common mappings • 2rthogonal² cylindrical² spherical • &apturing the real data • 2btain the color as well as the ¸' shape • 0anually specify the correspondence • 8sing graphical tools • 8sing automatic segmentation² unfolding
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&ommon 7exture &oordinate 0appings • 2rthogonal • &ylindrical • 6pherical
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&apture 5eal 'ata • &apture the depth as well as the color http ¹¹www´¸dface´ org¹media¹images´html
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0anually specifying the mapping • 7here are good tools to map the texture to the surface² for example² •'irectly painting on ¸' geometry •0anually align unfolded data on the image http ¹¹www´youtube´com¹watch" v#+4.'$'eu7)c &reating a 89 map on 0aya
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8nfolding the geometry 6egmenting the body into a set of charts
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