You can contact me by
Twitter: @petriw

9 Responses to Contact

  1. Christoffer says:

    Hi I like your xna shader tutorials and I have done 1,2 and 3 for xna 4.0. Is there going to be a 4th one?

  2. Rence says:

    dear digitalerr0r,

    i have viewed your tutorial about the blur shader and about Post process Grayscale, and i would like to use the effect files for a school project. may i do that?

    thanks in advance, great tutorials by the way!!

  3. He – appreciate the blog. However I could use a tutorial on Glow (Self Illumination ) Mapping – for example… a portion of the texture unaffected by shadows or light sources.

  4. Julien Greschner says:


    I really like your fourth tutorial on normal mapping for XNA 4.0. I am trying to add shaders to a game that I did for a school project but I have a little problem. I am using the same shader as in your tutorial but it seems that I have a small problem with the color because I have to put the ambiant color to 1.0 to see the full model. If I go under 1, the object becomes more and more transparent. I have been searching for a couple of days but I can’t find the error. The only difference that I have spotted is that I am using an .fbx file and you used a .x file for your tutorial, but I don’t know if it makes a difference.

    Thanks for your help!

  5. Seeing your speech on MSDN Tromsø made me remember why I wanted to become a programmer in the first place. Good work.

  6. bubbles says:

    Hello, Does using double precision for openGL 3.2 cause errors?

  7. Marylyn Downes says:

    Good evening, I was just visiting your site and submitted this message via your “contact us” form. The contact page on your site sends you messages like this to your email account which is why you are reading my message at this moment correct? This is the holy grail with any type of online ad, making people actually READ your message and that’s exactly what I just accomplished with you! If you have an advertisement you would like to promote to thousands of websites via their contact forms in the U.S. or anywhere in the world let me know, I can even focus on specific niches and my prices are very affordable. Write an email to:

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