Intro to DirectX Part 3

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Intro to DirectX Part 3

• Texturing

Danny Dyer
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Information about these slides

• Companion to the more detailed slides available
  on the TAGD resources page.
• http//www.gettagd.com/resources.php
• You can find the page numbers that reference the
  other slides at the bottom right of these slides.

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Texturing

• Objects in a scene will look very bland just
  colored and lit.
• Texturing can add a lot of detail to a scene.
• One step closer to being somewhat realistic.
• What we are trying to achieve is to apply a
  texture onto some surface (or model).

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Polygons and Vertices

• Talked briefly about polygons and vertices
  before.
• Lets look at the problem at a per-polygon level.
• If we can get one polygon textured, then it will
  be easy to get all of them textured in the same
  way.
• We need some new information at each vertex.
• Appropriately called texture coordinates.
• Textures can be thought of as wallpaper that is
  shrink-wrapped onto a surface.

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Texture Coordinates

• Texture coordinates are two-dimensional
  coordinate in texture space in the range 0.0
  1.0. (0.0, 0.0) represents the top-left side of
  the texture and (1.0, 1.0) represents the
  lower-right side of the texture.
• Using these texture coordinates we can figure out
  which area in the texture belongs over the
  polygon.
• Note from Nathan
• If you cant understand this, go castrate
  yourself any questions??

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How it works for a whole model

• Unwrapping process of generating texture
  coordinates so that we can apply a texture to a
  model.
• Usually dont need to know how to do this just
  that your model already has texture coordinates.

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Syntax

• Declare our data type
• IDirect3DTexture9 g_pTex
• Load in our texture can load most standard
  formats.
• D3DXCreateTextureFromFile(pd3dDevice,
  Ltexture.bmp,g_pTex)
• Set our texture before rendering
• pd3dDevice-gtSetTexture(0, g_pTex)

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Other Applications of Textures

• Multi-texturing
• Normal Maps
• Specular Maps
• Detail Textures
• Store Data

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Up Next

• Putting it all together
• bovicide_at_gmail.com