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Picking

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  1. Picking

  2. What is picking? • Selecting an object on the screen • What does this require? • Get Mouse Location • Compute what objects are rendered at the position

  3. Example

  4. How to do it • http://www.opengl.org/resources/faq/technical/selection.htm • http://gpwiki.org/index.php/OpenGL:Tutorials:Picking

  5. Color Picking • http://gpwiki.org/index.php/OpenGL_Selection_Using_Unique_Color_IDs

  6. GL_SELECTION • http://gpwiki.org/index.php/OpenGL:Tutorials:Picking • Render twice • glRenderMode(GL_SELECT); • SetViewport to one pixel • It counts how many objects render to that pixel • Read back # (glRenderMode(GL_RENDER) • Identify objects – use name stack

  7. What we’ve been doing

  8. gluUnProject • GLint gluUnProject( GLdouble winX, GLdouble winY, GLdouble winZ, const GLdouble *model, const GLdouble *proj, const GLint *view, GLdouble* objX, GLdouble* objY, GLdouble* objZ )

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