| Isurface, inverting the axis without changing default lighting direction [message #70727] |
Mon, 03 May 2010 18:16  |
cameron bowles
Messages: 5
Registered: May 2010
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Junior Member |
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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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| Re: Isurface, inverting the axis without changing default lighting direction [message #70787 is a reply to message #70727] |
Wed, 05 May 2010 12:38  |
penteado
Messages: 866
Registered: February 2018
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Senior Member
Administrator |
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On May 5, 3:24 pm, "Kenneth P. Bowman" <k-bow...@null.edu> wrote:
> In article
> < f460e955-39e9-40d4-be31-0beb89b53...@u20g2000pru.googlegroup s.com >,
> cameron bowles <cameronbowle...@gmail.com> wrote:
>
>> For anyone reading this, I ended up just defininn my "lights_id"
>> idebntifier to be that of Light_1 using this line of code in place of
>> the code in my second post;
>
>> lights_id = itool_obj -> FindIdentifiers('*LIGHT_1', /VISUALIZATIONS)
>
>> it now works a treat and looks good to boot.
>
>> Thanks again Ken and PP.
>
> I just want to make clear that this does not mean that I
> actually understand anything about how the iTools work. ;-)
Yes, they are a bit complicated. As far as I know (somebody please
correct this if I am wrong), the only book on it is the iTool
Developer's Guide, in IDL's help system.
In this particular case, the difference between the object with id
(...)/LIGHTS and the other two (with (...)/LIGHTS/LIGHT and (...)/
LIGHTS/LIGHT_1) is that (...)/LIGHTS is an _IDLITVISUALIZATION, which
is there as a container for the lights, to keep all the objects in a
hierarchy. The ambient and directional lights are IDLITVISLIGHT
objects, which are the actual lights. If you ask one of these two for
their parent, you get the object with the (...)/LIGHTS id:
IDL> light_1=ot->getbyidentifier('/TOOLS/SURFACE TOOL/WINDOW/VIEW_1/
VISUALIZATION LAYER/LIGHTS/LIGHT_1')
IDL> lights=ot->getbyidentifier('/TOOLS/SURFACE TOOL/WINDOW/VIEW_1/
VISUALIZATION LAYER/LIGHTS')
IDL> light_1->getproperty,parent=par & print, par eq lights
1
IDL> print,lights->findidentifiers()
/TOOLS/SURFACE TOOL/WINDOW/VIEW_1/VISUALIZATION LAYER/LIGHTS/LIGHT
/TOOLS/SURFACE TOOL/WINDOW/VIEW_1/VISUALIZATION LAYER/LIGHTS/LIGHT_1
IDL> help,lights
LIGHTS OBJREF = <ObjHeapVar18919(_IDLITVISUALIZATION)>
IDL> help,light_1
LIGHT_1 OBJREF = <ObjHeapVar19107(IDLITVISLIGHT)>
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| Re: Isurface, inverting the axis without changing default lighting direction [message #70807 is a reply to message #70727] |
Wed, 05 May 2010 00:27 |
cameron bowles
Messages: 5
Registered: May 2010
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Junior Member |
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On May 5, 10:49 am, pp <pp.pente...@gmail.com> wrote:
> On May 4, 10:06 pm, cameron bowles <cameronbowle...@gmail.com> wrote:
>
>
>
>> Thankyou so much for your tips Ken, they really helped. In the end I
>> got it to look kind of OK with this code;
>
>> void = ITGETCURRENT(TOOL=itool_obj)
>> lights_id = itool_obj -> FindIdentifiers('*LIGHTS', /
>> VISUALIZATIONS) ;Get lights ID
>> lights_obj = itool_obj ->
>> GetByIdentifier(lights_id) ;Get lights object
>> reference
>> lights_obj -> SetProperty, INTENSITY = 0.7, DISTANCE =
>> -20 ;Set intensity and distance (z axis)
>> itool_obj -> RefreshCurrentWindow
>
>> However I would really like to be able to set the location and
>> direction of the directional light, this should be possible with;
>
>> lights_obj -> SetProperty, DIRECTION = [x,y,z], DISTANCE = [x,y,z]
>
>> But I found that no matter what setting I had for x/y/z it wouldnt
>> affect the lighting. Has anyone done this manually? I roughly want to
>> have the light coming with a vector of [1,1,-1] from a position
>> direction of [-1,-1,1]. If anyone knows the tricks to get that working
>> I would appreciate it.
>
> I think your problem is the object you are picking to edit. By
> default, isurface makes two lights, one ambient (isotropic, I guess),
> and one directional. For instance,
>
> IDL> ids=itool_obj->findidentifiers('*LIGHT*',/visualization)
> IDL> for i=0,n_elements(ids)-1 do print,ids[i]
> /TOOLS/SURFACE TOOL/WINDOW/VIEW_1/VISUALIZATION LAYER/LIGHTS
> /TOOLS/SURFACE TOOL/WINDOW/VIEW_1/VISUALIZATION LAYER/LIGHTS/LIGHT
> /TOOLS/SURFACE TOOL/WINDOW/VIEW_1/VISUALIZATION LAYER/LIGHTS/LIGHT_1
>
> You are selecting the lights object, but the properties you want to
> edit are for the directional object, which in this case is LIGHT_1:
>
> IDL> light=itool_obj->getbyidentifier('/TOOLS/SURFACE TOOL/WINDOW/
> VIEW_1/VISUALIZATION LAYER/LIGHTS/LIGHT')
> IDL> light->getproperty,name=name & print,name
> Ambient Light
> IDL> light=itool_obj->getbyidentifier('/TOOLS/SURFACE TOOL/WINDOW/
> VIEW_1/VISUALIZATION LAYER/LIGHTS/LIGHT_1')
> IDL> light->getproperty,name=name & print,name
> Directional Light
>
> With the object for the directional light, I can move and point it
> around with
>
> light->setproperty,location=[1,1,-1],direction=[-1,-1,1]
>
> Note that it may take a
>
> itool_obj->commitactions
>
> for the image to be updated after you change the objects.
Thanks pp!
for pointing out my error, as always it is teh simple error that
stumps me.
For anyone reading this, I ended up just defininn my "lights_id"
idebntifier to be that of Light_1 using this line of code in place of
the code in my second post;
lights_id = itool_obj -> FindIdentifiers('*LIGHT_1', /VISUALIZATIONS)
it now works a treat and looks good to boot.
Thanks again Ken and PP.
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| Re: Isurface, inverting the axis without changing default lighting direction [message #70815 is a reply to message #70727] |
Tue, 04 May 2010 18:49 |
penteado
Messages: 866
Registered: February 2018
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Senior Member
Administrator |
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On May 4, 10:06 pm, cameron bowles <cameronbowle...@gmail.com> wrote:
> Thankyou so much for your tips Ken, they really helped. In the end I
> got it to look kind of OK with this code;
>
> void = ITGETCURRENT(TOOL=itool_obj)
> lights_id = itool_obj -> FindIdentifiers('*LIGHTS', /
> VISUALIZATIONS) ;Get lights ID
> lights_obj = itool_obj ->
> GetByIdentifier(lights_id) ;Get lights object
> reference
> lights_obj -> SetProperty, INTENSITY = 0.7, DISTANCE =
> -20 ;Set intensity and distance (z axis)
> itool_obj -> RefreshCurrentWindow
>
> However I would really like to be able to set the location and
> direction of the directional light, this should be possible with;
>
> lights_obj -> SetProperty, DIRECTION = [x,y,z], DISTANCE = [x,y,z]
>
> But I found that no matter what setting I had for x/y/z it wouldnt
> affect the lighting. Has anyone done this manually? I roughly want to
> have the light coming with a vector of [1,1,-1] from a position
> direction of [-1,-1,1]. If anyone knows the tricks to get that working
> I would appreciate it.
I think your problem is the object you are picking to edit. By
default, isurface makes two lights, one ambient (isotropic, I guess),
and one directional. For instance,
IDL> ids=itool_obj->findidentifiers('*LIGHT*',/visualization)
IDL> for i=0,n_elements(ids)-1 do print,ids[i]
/TOOLS/SURFACE TOOL/WINDOW/VIEW_1/VISUALIZATION LAYER/LIGHTS
/TOOLS/SURFACE TOOL/WINDOW/VIEW_1/VISUALIZATION LAYER/LIGHTS/LIGHT
/TOOLS/SURFACE TOOL/WINDOW/VIEW_1/VISUALIZATION LAYER/LIGHTS/LIGHT_1
You are selecting the lights object, but the properties you want to
edit are for the directional object, which in this case is LIGHT_1:
IDL> light=itool_obj->getbyidentifier('/TOOLS/SURFACE TOOL/WINDOW/
VIEW_1/VISUALIZATION LAYER/LIGHTS/LIGHT')
IDL> light->getproperty,name=name & print,name
Ambient Light
IDL> light=itool_obj->getbyidentifier('/TOOLS/SURFACE TOOL/WINDOW/
VIEW_1/VISUALIZATION LAYER/LIGHTS/LIGHT_1')
IDL> light->getproperty,name=name & print,name
Directional Light
With the object for the directional light, I can move and point it
around with
light->setproperty,location=[1,1,-1],direction=[-1,-1,1]
Note that it may take a
itool_obj->commitactions
for the image to be updated after you change the objects.
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