Poirot

01-25-2015, 04:27 AM

Hi,

This may seem like a trivial question, but I want to understand everything completely.

In the section of the tutorial mentioned in the title, in the seventh paragraph, it says that "...the offset from the projection plane to the eye, is always -1". I don't understand why it is -1, instead of +1. Since we're talking about camera space, where Z grows (gets more positive) when coming closer to the viewer, shouldn't the offset be +1, that is, one unit closer to the viewer than where the plane is? I probably have something mixed up, but I'm not sure exactly what.

I really enjoy the tutorial so far, so if the author reads this, thank you!

This may seem like a trivial question, but I want to understand everything completely.

In the section of the tutorial mentioned in the title, in the seventh paragraph, it says that "...the offset from the projection plane to the eye, is always -1". I don't understand why it is -1, instead of +1. Since we're talking about camera space, where Z grows (gets more positive) when coming closer to the viewer, shouldn't the offset be +1, that is, one unit closer to the viewer than where the plane is? I probably have something mixed up, but I'm not sure exactly what.

I really enjoy the tutorial so far, so if the author reads this, thank you!