diff --git a/fractional/notes/09e-textures.pdf b/fractional/notes/09e-textures.pdf
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diff --git a/fractional/notes/texmap.pdf b/fractional/notes/texmap.pdf
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diff --git a/fractional/notes/texture-mapping.url b/fractional/notes/texture-mapping.url
index b838d2d..fd55dc7 100644
--- a/fractional/notes/texture-mapping.url
+++ b/fractional/notes/texture-mapping.url
@@ -2,3 +2,12 @@ https://en.wikipedia.org/wiki/Texture_mapping
 http://www.gamers.org/dEngine/quake/papers/checker_texmap.html
 https://www.cs.uic.edu/~jbell/CourseNotes/ComputerGraphics/TextureMapping.html
 http://www.decew.net/OSS/References/chapter_2_texture_mapping.pdf
+
+# example affine texture mapping
+http://archive.gamedev.net/archive/reference/articles/article852.html
+
+
+http://www.lysator.liu.se/~mikaelk/doc/perspectivetexture/
+
+# Shader... This also describes z-Buffer... :)
+https://people.ece.cornell.edu/land/OldStudentProjects/cs490-95to96/GUO/report.html