Magnification and Minification

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1 Magnification and Minification Lecture 30 Robb T. Koether Hampden-Sydney College Fri, Nov 6, 2015 Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

2 Outline 1 Applying Textures 2 Magnification 3 Minification 4 Filters 5 Assignment Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

3 Outline 1 Applying Textures 2 Magnification 3 Minification 4 Filters 5 Assignment Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

4 Applying Textures When a texture is applied to a primitive, the texels are mapped to the pixels of the rasterized primitive (usually a triangle). There is rarely a one-to-one match, leading to one of two situations. One texel maps to several pixels. Several texels map to one pixel. Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

5 Applying Textures Definition (Magnification) Magnification is the mapping of one texel to several pixels (because the texel is magnified). Definition (Minification) Minification is the mapping of several texels to one pixel (because the texels are reduced). Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

6 Applying Textures When mapping texels to pixels, we may choose between Applying the nearest texel to the pixel. Or linear interpolation among the four nearest texels. Interpolation uses a 2-dimensional weighted average of the 4 nearest texels, called bilinear interpolation. Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

7 Outline 1 Applying Textures 2 Magnification 3 Minification 4 Filters 5 Assignment Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

8 Magnification of Texels (Nearest) 1 texel mapped to pixels Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

9 Magnification of Texels (Nearest) 1 texel mapped to pixels Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

10 Magnification of Texels (Nearest) 1 texel mapped to pixels Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

11 Magnification of Texels (Nearest) 1 texel mapped to pixels Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

12 Magnification of Texels (Nearest) 1 texel mapped to pixels Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

13 Magnification of Texels (Nearest) 1 texel mapped to pixels Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

14 Magnification of Texels (Nearest) 1 texel mapped to 8 8 pixels Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

15 Magnification of Texels (Nearest) 1 texel mapped to 4 4 pixels Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

16 Outline 1 Applying Textures 2 Magnification 3 Minification 4 Filters 5 Assignment Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

17 Minification of Texels (Nearest) Texels Pixels Minification at a 2 : 1 ratio Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

18 Minification of Texels (Nearest) Texels Pixels Minification at a 2 : 1 ratio Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

19 Minification of Texels (Nearest) Texels Pixels Minification at a 2 : 1 ratio Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

20 Minification of Texels (Nearest) Texels Pixels Minification at a 2 : 1 ratio Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

21 Minification of Texels (Nearest) Texels Pixels Minification at a 5 : 2 ratio Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

22 Minification of Texels (Nearest) Texels Pixels Minification at a 5 : 2 ratio Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

23 Minification of Texels (Nearest) Texels Pixels Minification at a 5 : 2 ratio Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

24 Minification of Texels (Nearest) Texels Pixels Minification at a 5 : 2 ratio Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

25 Other Problems 64 Texels 36 Pixels Undesirable effects Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

26 Other Problems 64 Texels 36 Pixels Undesirable effects Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

27 Other Problems 64 Texels 36 Pixels Undesirable effects (nearest) Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

28 Other Problems 64 Texels 36 Pixels Undesirable effects (interpolated) Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

29 Other Problems Texture Nearest Undesirable effects (nearest) Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

30 Other Problems Texture Interpolated Undesirable effects (interpolated) Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

31 Outline 1 Applying Textures 2 Magnification 3 Minification 4 Filters 5 Assignment Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

32 Filters Filters gltexparameteri(gl_texture_2d, GL_TEXTURE_MAG_FILTER, GL_NEAREST); gltexparameteri(gl_texture_2d, GL_TEXTURE_MIN_FILTER, GL_NEAREST); We can specify filters for magnification and for minification. GL_NEAREST will use the nearest texel. Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

33 Filters Filters gltexparameteri(gl_texture_2d, GL_TEXTURE_MAG_FILTER, GL_LINEAR); gltexparameteri(gl_texture_2d, GL_TEXTURE_MIN_FILTER, GL_LINEAR); We can specify filters for magnification and for minification. GL_LINEAR will interpolate texels. Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

34 Outline 1 Applying Textures 2 Magnification 3 Minification 4 Filters 5 Assignment Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

35 Homework Homework Read pages : Texture Mapping & Basic Texture Types Read pages : Texture Formats Robb T. Koether (Hampden-Sydney College) Magnification and Minification Fri, Nov 6, / 17

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