3D Fundamentals Tutorial 7

Textures. Put purdy pictures onto your triangles. Lot of interpolation and stuff.

Video

The tutorial video is on YouTube here.

• What is texture mapping and why do we want it? 0:14

• Mapping a picture onto a geometry (triangles)
• Basically, to create real life imagery with high fidelity

• How to approach texture mapping 2:45

• How NOT to do it: sccaling and rotating points of a sprite
• Right way: Generate a mapping of vertices of our geometry to points in our texture
• This requires:

- Transform the vertices to screen space

- Rasterize (using scanlines)

- Interpolate from the geometry's screen coordinates (x,y) to coordinates of the texture (u,v)

- Use the texture's color at (u,v) to draw the pixel on the screen at (x,y)

• Interpolating between three vertices 5:33
• Pre-stepping 7:20

• This is done based on the positions of the center of the starting pixel & the scanline

• Implementing these concepts into code 8:42

• The TexVertex class
• Incorporating data & methods in Cube.h
• Implementing DrawTriangleTex(...) triangle drawing with textures in Graphics.h and Graphics.cpp 10:55

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Downloads

The GitHub repository for the tutorial code is here.

See also

• Planet Chili Patreon
• Next in series (Tutorial 8)
• 3D Fundamentals Series