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Thread: Good Job Interview Questions

  1. #1
    Junior Member Regular Contributor
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    Good Job Interview Questions

    Recently, I interviewed someone who was described to me as a computer graphics expert. Being my first interview, I didn't know what kind of questions to ask him in order to evaluate his expertise. Luckily my first question was, "What is gimbal lock?", and to my surprise, he didn't know. I can't imagine a person at an "expert" or an even "advanced" level not knowing what gimble lock is.

    Anyway, if I have to interview more people, I can't go in armed with just one question! What are some effective interview questions to determine a person's knowledge of 3D graphics?

  2. #2
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    Re: Good Job Interview Questions

    What was the last book you have read? And what did you learn?

  3. #3
    Super Moderator OpenGL Guru dorbie's Avatar
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    Re: Good Job Interview Questions

    Well jambolo I can imagine an expert might not know.

    If you're interviewing someone for a graphics position and you don't have a clue about it then maybe you should leave that aspect to another interviewer who does. Ask about what you DO know. Certainly to ask the question you did and form your opinion on that is misguided. If your question draws a blank you should go on and ask about Euler angles or why one might use quaternians, rather than making the assumption you apparently did.

    Sounds like the candidate had a lucky escape to me.

    [This message has been edited by dorbie (edited 01-25-2003).]

  4. #4
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    Re: Good Job Interview Questions

    Firstly, gimbal lock is hardly a graphics question... I would most likely call it a 3d mathematics question.

    Perhaps a better question might have been if they are familiar with Quaternions? Whether use Opengl and/or Dx? What they have used these API's for and what features they have used (eg. VP's etc.)

  5. #5
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    Re: Good Job Interview Questions

    Ask to see his/her previous work, and go from there.

  6. #6
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    Re: Good Job Interview Questions

    What could octree, BSP, etc could be used for in 3D graphics and is there principle.

    There are plenty of questions one could ask, so an expert should be able to answer 90% or something.

    Asking about previous experience, demonstration programs is part of the interview too.
    ------------------------------
    Sig: http://glhlib.sourceforge.net
    an open source GLU replacement library. Much more modern than GLU.
    float matrix[16], inverse_matrix[16];
    glhLoadIdentityf2(matrix);
    glhTranslatef2(matrix, 0.0, 0.0, 5.0);
    glhRotateAboutXf2(matrix, angleInRadians);
    glhScalef2(matrix, 1.0, 1.0, -1.0);
    glhQuickInvertMatrixf2(matrix, inverse_matrix);
    glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
    glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);

  7. #7
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    Re: Good Job Interview Questions

    I would start with something more general.
    For example:
    "Have you done any work in...
    occlusion culling
    lighting effects
    collision detection
    physics
    animation
    etc.
    ?"


    When the interviewee affirms, then I would ask for more specific information on that topic.
    For example:
    Interviewer: "Do you have any animation experience?"
    Interviewee: "Nothing implemented, but I've read several papers on the topic."
    Interviewer: "Is there anything in animation that you've studied in particular, like inverse kinematics or keyframe interpolation?"


    I would make a note of the topic or topics that the the interviewee seems most enthusiastic or informed about and ask something like, "What interests you most about insert topic here?"

  8. #8
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    Re: Good Job Interview Questions

    Yes, dorbie. I suck at interviewing. That's why I'm asking questions so I can learn to do a better job. Why do you insult me?

    I think the fact that he had never heard of gimbal lock is very telling. How many people on this board have never heard of gimbal lock?

    And talk about assumptions...you assume I "don't have a clue" and you are way off.

  9. #9
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    Re: Good Job Interview Questions

    Asking the applicant to solve or think about some sort of problem might be better than asking straight out pop quiz type questions. You might hire a bad programmer who knows lots of buzzwords that way. Try "Lately we've been thinking about shader management/shadow algorithms/geometry transfer optimizations here at Monkey Interactive and we've run into issues a,b and c. What are your thoughts on that?" Or something along those lines.

  10. #10
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    Re: Good Job Interview Questions

    well, first of all "expert" sounds bit silly.

    and for this question...if this "expert" didn't know 1 term you interviewed, it doesn't mean anything..

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