Re: Ggnuplot-beta@lists.sourceforge.netnuplot crashing for "hidden3d undefined" ?

[Thomas S. <t.s...@fz...>]

Hans-Bernhard Br=C3=B6ker-2 wrote:
>=20
>> the macros 'GET_MIN' and 'GET_MAX' should be different for checking
>> min or max values in x- and y- and for checking min or max values in
>> z-direction.
>=20
> No.  At the point in the algorithm where these are used, x, y and z have
> already been turned into view coordinates.  They are checked against the
> view frustum,
>=20

ok, yes, but,
we are scaling the whole plot by moving the mouse sidewards while
pressing the middle button. there the comparison of the maximum
x-, y-, z-values to 'surface_scale' is the right one, and 'surface_scale'
increases when zooming in.

the assertion mainly accurs when scaling only the z-coordinate (in plot
coordinates) by moving the mouse pointer up (middle button pressed).
here, 'surface_scale' is not affected at all, 'surface_zscale' increases
instead. but the comparison of the maximum y-value (in view coordinates)
is done against 'surface_scale' which doesn't change at all during this
process.

that's why i think that the y-min/max-values should be checked
against some combination of 'surface_scale' and 'surface_zscale'.

--=20
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