Changes between Version 20 and Version 21 of tutorial

Timestamp:

Jun 28, 2013, 11:04:44 PM (12 years ago)

Author:

leon

Comment:

Rotate normals too.

tutorial

@@ -480 +480 @@
 }}}
 === Exercises #3 ===
- 1. Introduce zoom in/out functionality of the viewer by adding mouse wheel events to the end of `mouse()`
+ 1. OK, it rotates. But how come the light rotates with the teapot? I'm pretty sure that the light is not rotated while the teapot vertices are. Answer: Take a look into the `normal`. You need to rotate the vertex normal in the `vertex_shader[]` too! With a code like:
+  {{{
+  #!c
+  vec4 n = RotationMatrix*vec4(gl_NormalMatrix*gl_Normal, 1);\
+  normal=normalize(n.xyz);
+  }}}
+ 2. Introduce zoom in/out functionality of the viewer by adding mouse wheel events to the end of `mouse()`
   {{{
   #!c
@@ -500 +506 @@
    if (location >= 0)  glUniform1f(location, zoom);
   }}}
+
+
+
   
-
-
-