Changes between Version 29 and Version 30 of tutorial

Timestamp:

Jun 29, 2013, 10:32:53 PM (11 years ago)

Author:

leon

Comment:

Point cloid

tutorial

@@ -589 +589 @@
 }
 }}}
+[[Image(point-cloud.png,right)]]
+=== Exercises #3 ===
+ 1.Insert {{{teapot.c}}} interactivity example into {{{wavefront.c}}} above and save it as {{{motorbike.c}}}.
+   Verify that there is no compile problems ant that the {{{main()}}} contains {{{read_wavefront("motorBike.obj");}}}. 
+   Disable lengthy saving in {{{main()}}}.
+ 2. Instead of drawing of the teapot in {{{display()}}} we will draw single vertex array object as a point cloud with 
+  {{{
+  #!c
+   glDrawArrays(GL_POINTS, 0, vertices);
+  }}}
+  To be able to draw this, we need to prepare Vertex Array Object and buffer with {{{init();}}} that is called from {{{main()}} just before {{{glutMainLoop();}}}
+  {{{
+  #!c
+void init()
+{
+  GLuint VAO[1];
+  GLuint Buffer[1];
+  glGenVertexArrays(1, VAO);
+  glBindVertexArray(VAO[0]);
+  glGenBuffers(1, Buffer);
+  glBindBuffer(GL_ARRAY_BUFFER, Buffer[0]);
+  glBufferData(GL_ARRAY_BUFFER, vertices*3*sizeof(GLfloat),
+               vertex, GL_STATIC_DRAW);
+  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, NULL);
+  glEnableVertexAttribArray(0);
+}
+}}}
+