Hi,
The perceived problem is most likely that you are used to standing on a
sidewalk and looking at a world in perspective where your line of sight is
parallel to the x-z plane. In this situation, lines in the y-axis are
straight. If though you go up in a tall building or airplane and look down at
an angle, the bend. The problem is your mind knows what its orientation is and
mentally compensates the image for what it expects.
For your program, try to orient the up vector of your view frustrum along the
y-axis.
r/ Gary Graf
Hardy Henneberg wrote:
> Hello,
> I posted a mail some days ago about vertical lines showing up
> non-vertical. I only got one answer, maybe because the problem wasn't
> clearly explaned. I think many of you have got the same problem - at
> least those of you, who makes programs simulating the world people
> normally exists in. I think of this world as 2� dimension, 1 x, 1 z and
> � y, because we are not moving very much in the Y-dimension compared to
> the two others. That matters, because our brain treat the y-dim.
> different than x and z, and thats why we would like to see vertical
> lines as vertical -also in perspective - though they really shouldn't be
> from a mathematical point of view.
> The problem is that in java3d I can only choose among an orthogonal and
> a perspective projection - I realy need perspective in xz plane and
> othogonality in y-direction.
> I would like some comments on this issue, before I am digging down in
> the mathematics and make my own projection.
>
> kind regards
> Hardy Henneberg
>
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