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Topic: World Space Minor Confusion



  
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   World Space Minor Confusion
 Poster : gruddo
 Posts: 4
 Country : England
 City: Liverpool

  
Posted by gruddo on 27/11/2006 at 11:12:01
Hi Riemer,

Great Tutorial. I just thought I would let you know a few things that threw me whilst reading this chapter.

They are minor and please don't think i am picky.

You say "The first parameter defines the position. We position it 30 units above our (0,0,0) point, the origin."  Hoever you position it forty units above.

Matrix viewMatrix = Matrix.CreateLookAt(new Vector3(0, 0, 40), new Vector3(0, 0, 0), new Vector3(0, 1, 0))


In the chapter "Drawing a triangle" you specify the color of the vertices as Red,Green,Yellow but then change it Red,Yellow,Green in this chapter. I was confused because I only changed the float arguments and didn't replace the code and wondered why my traingle was not orientated like yours.

I repeat these are minor points but maybe if you change them other newbies will be less confused.
 Poster : riemer
 Posts: 1392
 Country : Belgium
 City: Antwerp

  
Posted by riemer on 29/11/2006 at 13:57:09
Thanks for the comments! Indeed, especially the first chapters mustn't scare away interested visitors because of silly mistakes.

This pc doesn't have xna installed however, so I was only able to fix the first comment.

Thanks!
 Poster : Anonymous
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Posted by Anonymous on 16/12/2006 at 20:42:28
I also wanted to add as a simplifier that your camera and UP vectors can be set using Vector3.Zero and Vector3.Up which are part of the Vector3 intellisense.

-Joe
 Poster : riemer
 Posts: 1392
 Country : Belgium
 City: Antwerp

  
Posted by riemer on 17/12/2006 at 07:53:11
Thanks for the addition, but I'm not sure if it would be wise to do that... I think it's better to show which vectors we're using. The .Up also always equals (0,1,0), which is not always what you'ld want. I think it can cause a lot of confusion.
 Poster : Anonymous
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Posted by Anonymous on 11/02/2007 at 22:58:05
Just curious why you don't like using the Y-axis as up, and in the next series are using the Z-axis. This can be somewhat confusing, at least it is to me.

  
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