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Isurface, inverting the axis without changing default lighting direction [message #70727]

Mon, 03 May 2010 18:16

cameron bowles
Messages: 5
Registered: May 2010

Junior Member

Hi everyone, long time reader first time poster.

I have run into this problem where I want to plot a surface using the
iSurface functionality of IDL 7.0. I want the Y-axis to be inverted
(ie. showing the maximum value at the common axes point. I can simply
do this with Yrange = [max[Y], min[Y]], but when I do this the
lighting vector for the surface flips around the Y=0 plane and the
surface is highlighted from some strange angle that doesnt highlight
the surface at all.

I tried two other solutions;

The first was trying the Ytickvalues = Ynew, where Ynew was a new
vector created to go from Ymax to Ymin with equal length to the Ydata.
This keyword had no effect the plotted Yaxis values are still the
values of the Yaxis values defined by the iSurface command.

The second was to try to overplot it ontop of another iSurface axis
set, but the same issue occurs as the lighting direction is still
defined by the axis direction.

Here is some sample code;
ISURFACE, Data, Xvalues, Yvalues, $
Xrange = [(*ptrinfo).Xmin, (*ptrinfo).Xmax], $
Yrange = [(*ptrinfo).Xmin, (*ptrinfo).Xmax], $
Zrange = [(*ptrinfo).Zmin, (*ptrinfo).Zmax], $
clip_planes = [[-1,0,0,(*ptrinfo).Xmin],[0,1,0,Ymin-0.01],
[0,0,-1,Zmin], [1,0,0,-1*(*ptrinfo).Xmax],[0,1,0,Ymax-0.01],
[0,0,1,-1*Zmax]], $
style = 2, $
shading = 1, $
skirt = 0.0, $
/show_skirt, $
zero_opacity_skip = 0, $
color = [225, 184, 0], $
transparency = 20

where Data is a 2D data array, and ptrinfo is just a pointer to my
structure array I use to pass variables between different procedures.

I hope someone can help with a solution.

Regards,
Cameron

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[Message index]

		Isurface, inverting the axis without changing default lighting direction By: cameron bowles on Mon, 03 May 2010 18:16
		Re: Isurface, inverting the axis without changing default lighting direction By: penteado on Wed, 05 May 2010 12:38
		Re: Isurface, inverting the axis without changing default lighting direction By: cameron bowles on Wed, 05 May 2010 00:27
		Re: Isurface, inverting the axis without changing default lighting direction By: penteado on Tue, 04 May 2010 18:49

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