Changes between Version 29 and Version 30 of tutorial


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Timestamp:
Jun 29, 2013, 10:32:53 PM (6 years ago)
Author:
leon
Comment:

Point cloid

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  • tutorial

    v29 v30  
    589589}
    590590}}}
     591[[Image(point-cloud.png,right)]]
     592=== Exercises #3 ===
     593 1.Insert {{{teapot.c}}} interactivity example into {{{wavefront.c}}} above and save it as {{{motorbike.c}}}.
     594   Verify that there is no compile problems ant that the {{{main()}}} contains {{{read_wavefront("motorBike.obj");}}}.
     595   Disable lengthy saving in {{{main()}}}.
     596 2. Instead of drawing of the teapot in {{{display()}}} we will draw single vertex array object as a point cloud with
     597  {{{
     598  #!c
     599   glDrawArrays(GL_POINTS, 0, vertices);
     600  }}}
     601  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();}}}
     602  {{{
     603  #!c
     604void init()
     605{
     606  GLuint VAO[1];
     607  GLuint Buffer[1];
     608  glGenVertexArrays(1, VAO);
     609  glBindVertexArray(VAO[0]);
     610  glGenBuffers(1, Buffer);
     611  glBindBuffer(GL_ARRAY_BUFFER, Buffer[0]);
     612  glBufferData(GL_ARRAY_BUFFER, vertices*3*sizeof(GLfloat),
     613               vertex, GL_STATIC_DRAW);
     614  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, NULL);
     615  glEnableVertexAttribArray(0);
     616}
     617}}}
     618