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# Composition Mapping from Watt, Ch. 8.

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Composition Mapping from Watt, Ch. 8 Jonathan Han Subjects Talked about Surface Guide to Models Knock Maps, Light Maps Environment (Reflection) Mapping 3D Compositions Intuitive Surface Mapping What is Mapping? Doling out hues to the pixels on a 3D model to mimic. . . Shading Specular "shading"
Transcripts
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Composition Mapping from Watt, Ch. 8 Jonathan Han

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Topics Discussed Texture Map to Models Bump Maps, Light Maps Environment (Reflection) Mapping 3D Textures Interactive Texture Mapping

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What is Mapping? Relegating hues to the pixels on a 3D model to reenact. . . Shading Specular âcolorâ Surface annoyance Transparency

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2D Texture Maps to Polygon Mesh Objects Association of 2 direction frameworks between the cross section and the guide Inverse Mapping versus Forward Mapping Bilinear Interpolation Problem is parametrization of item surface

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Mapping by Intermediate Surface Map - > (S map) Simple 3D shape - > (O map) Projection onto complex cross section Plane, barrel, 3D shape, circles all conceivable moderate shapes

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O Mapping

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O Mapping Result

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Bi-Cubic Parametric Patch If an article is as of now a quadric or a cubic, then the surface have a direction framework that covers each point as of now. Essentially reproduce u and v by the determination in pixels to get area on composition map

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Parametric Example

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Parametric Patch (contâd) Divide lattice up to individual parametric surfaces, and spot the composition over each

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Parametric Patch (contâd) Assign (u, v) directions to focuses on cross section surface, and insert between these focuses

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Billboards Technique to make pseudo-sensible 3D objects when seen in tightened bearings

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Bump mapping Simulation for surface irritation without adding polygons to the cross section The lighting changes per-pixel to accomplish said reproduction

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What is a Bump Map? Exhibit of qualities that speak to objectâs tallness minor departure from little scale Combined with surface typical to assess lighting mathematical statement

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Light Maps Like Bump Maps, Light Maps store data on a surface thatâs not simply shading Simulate confined lighting Same guide connected to various cross section to make the same lighting example

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Light Maps Example No light maps With light maps

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Environmental Mapping To substitute lavish beam following for displaying sparkling articles, 2D environment guide are textured onto the item.

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Creating an Environmental Map Sphere guide: Render scene from inverse edge of yield camera, and apply as surface guide Problem: Inaccurate when the article is round

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Creating an Environmental Map Ball Map: Create a reflected circle and spot at estimated area of item â render the circle. Issue: Non-uniform inspecting at non-unique perspective

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Creating an Environmental Map Cube Map: Place a camera at area of article and evacuate object â take depictions at 6 headings.

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Extended Environmental Mapping Surface Properties: 2 maps â diffuse and specular, joined like in Phong shading Diffuse: Indexed by surface typical Specular: Indexed by reflected perspective vector

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3-D Texture Domains Instead of a 2D composition design, why not make the composition 3D? Bypass issues in composition pressure and surface progression Problem: Only have surface that are characterized in 3D

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Easy Example If Z-hub whole number is even, make it red. If not, make it white.

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Easy Example No. 2 Sine and slope capacities

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3D Noise Used to misshape existing surface to shape unpredictable and intriguing examples

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Perlinâs Noise Lattice The Perlinâs Method of Noise Generation: Lattice of focuses (i,j,k), where i, j, and k are whole numbers â each doled out an irregular number. Qualities between i, j, and k straightly (or something else) interjected

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Adjusting Noise Instead of noise(x,y,z), we can utilize noise(f*x,f*y,f*z) * a to tweak result f â recurrence a - plentifulness

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Creating Recognizable Textures Turbulate stripes to imitate marble composition (marble(x) = marble_colour (sin(x + turbulence(x))

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3D Textures for Animation Emulate fire by adding time measurement to 3D Texture Map Successive âslicesâ of commotion rendered for glimmering fire

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Interactive Texturing Assist specialists in making accommodating surfaces Applet

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Interactivity in Texturing Symmetrical Models Model put in jumping box Artist paints profile composition as 2D picture Image plane-textured onto the model Artist conforms picture and re-render for results

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âPaintingâ Textures Artist âpaintsâ surfaces onto models specifically Imbues shading, luster, and in addition example to show suddenly as craftsman chooses it

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Implementing Texture âPaintâ Auxiliary edge support â thing cushion â made Screen cursorâs area on model offers pointer to position on article surface Requires parametrized surface â partition objectâs surface into various micropolygons

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Discussion Additional conceivable outcomes for âcleverâ courses around lavish displaying? Applications for 3D surfaces and clamor? In mix with n

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