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Picking

Picking. What is picking?. Selecting an object on the screen What does this require? Get Mouse Location Compute what objects are rendered at the position. Example. How to do it. http://www.opengl.org/resources/faq/technical/selection.htm

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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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