Hi Mohammad, I think you need to add values to the transfer function, as is done in the cookbook: http://yt-project.org/doc/cookbook/simple_plots.html#simple-volume-rendering You can use tf.add_layers, or any of the other tf modifier: http://yt-project.org/doc/api/generated/yt.visualization.volume_rendering.tr... On Wed, Sep 4, 2013 at 10:04 AM, mohammad safarzadeh <mtsafarzadeh@gmail.com
wrote:
Hi, I am trying to do VR on a halo in my zoom-in region which is a dark matter only sim, but I get a black image when I try this:
L=[1,1,1]
W=1/pf["Mpc"]
n [16]: mi,ma=region.quantities["Extrema"]("particle_density")[0]
In [17]: mi
Out[17]: 0.0
In [18]: ma
Out[18]: 4.5282895435060503e-24
In [21]: np.log10(ma)
Out[21]: -23.344065811694637
mi=-24
ma=np.log10(ma)
tf = ColorTransferFunction((mi,ma))
cam=region.pf.h.camera(c, L, W, Npixels, tf,fields=["particle_density"],log_fields=True)
ImageArray([[[ 0., 0., 0., 1.],
[ 0., 0., 0., 1.],
[ 0., 0., 0., 1.],
...,
[ 0., 0., 0., 1.],
[ 0., 0., 0., 1.],
[ 0., 0., 0., 1.]],
[[ 0., 0., 0., 1.],
[ 0., 0., 0., 1.],
[ 0., 0., 0., 1.],
...,
[ 0., 0., 0., 1.],
[ 0., 0., 0., 1.],
[ 0., 0., 0., 1.]],….
what is the mistake that I am doing?
-Regards,
Mohammad
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