Difference between revisions of "3D Fundamentals Tutorial 7"

Revision as of 05:42, 17 May 2020

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

The tutorial video is on YouTube here.

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)

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

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

The GitHub repository for the tutorial code is here.

@@ Line 10: / Line 10: @@
 :* Mapping a picture onto a geometry (triangles)
 :* Basically, to create real life imagery with high fidelity
+</div>
 * How to approach texture mapping [https://youtu.be/UaOJxtWxICc?t=2m45s 2:45]
 :* How NOT to do it: sccaling and rotating points of a sprite
@@ Line 38: / Line 39: @@
 * [https://youtu.be/UaOJxtWxICc?t=0m1s 0:1]
 * [https://youtu.be/UaOJxtWxICc?t=0m1s 0:1]
-</div>
 </div>