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 • $ntialiasing±textures
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7exture 0apping :hy needed" • $dding details using high resolution polygon meshes is costly • 1ot very suitable for real±time applications Kb DSTO $RO $R±S\QXSY
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7exture mapping± • 0ethod of improving surface appearance by mapping images onto the surface • 'one at the rasterization stage
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3rinciples of 7exture 0apping )or each triangle in the model± establish a corresponding region in the texture image ,mage has much higher resolution than mesh 'uring the rasterization± color the surface by that of the texture 89 coordinates the ²' coordinates of the texture map
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,nterpolating the uv coordinates • 7o compute the 89 inside the triangle± interpolate those at the vertices • 'one at the rasterization stage • 8se barycentric coordinates u# α u ² ´ β u ³ ´ γ u µ v # α v ² ´ β v ³ ´ γ v µ
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1.What is the color of the 3 vertices of the triangle? 2.How will the textured triangle look like?
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How to Produce a UV Mapping? • 8se common mappings • 2rthogonal± cylindrical± spherical • &apturing the real data • 2btain the color as well as the ²' shape • 0anually specify the correspondence • 8sing graphical tools • 8sing automatic segmentation± unfolding
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&ommon 7exture &oordinate 0appings • 2rthogonal • &ylindrical • 6pherical
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&apture 5eal 'ata • &apture the depth as well as the color http ±±www²³dface² org±media±images²html
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0anually specifying the mapping • 7here are good tools to map the texture to the surface± for example± •'irectly painting on ²' geometry •0anually align unfolded data on the image http ³³www´youtube´com³watch" v#+4.'$'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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cg8_2013 - Computer Graphics Lecture 8 Antialiasing Texture...

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