My guess is that you need to play with the alpha values when you add_layers.  From the docs, if you don't supply alpha, it is:

"The alpha value height for each Gaussian. If not supplied, it is calculated as the logspace between -2.0 and 0.0"

so it looks like the last value you add will have alpha = 1, i.e. opaque.

On Fri, May 23, 2014 at 10:57 AM, Stephanie Tonnesen <> wrote:
Hi all,

I am trying to make a nice volume rendering, and am having some trouble.  My camera commands are:
tf = ColorTransferFunction((-29,-24))
tf.add_layers(8,w=0.1,colormap="Hue Sat Value 2")
tf.sample_colormap(-26.5,w=0.02,colormap="Hue Sat Value 2")
cam =[0.0,2.,1.8],[0.0,-1.0,-0.2],4.0,512,tf)

I will attach the image, also (v11).  First, when I use add_layers, can I get yt to print out WHERE the layers are?  Second, but related, when I just use add_layers I only see the higher density gas.  I have to add sample_colormap to see lower density gas (the blue stuff).  Compare v11 to v6 to see what I am talking about. 



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Michael Zingale
Associate Professor

Dept. of Physics & Astronomy • Stony Brook University • Stony Brook, NY 11794-3800
phone:  631-632-8225