headlight defaults

[michaelrepucci]

Hi, does anyone know the defaults for the headlight? I can't seem to find that in the documentation or anywhere online. Thanks!

[farshizzo]

By default the head light is directional, pointing in the +Z direction, with the following color values:

diffuse: [0.8,0.8,0.8]
ambient: [0.05,0.05,0.05]
specular: [1,1,1]

[michaelrepucci]

Oh, I didn't realize that lights could have diffuse, ambient, and specular components. Some follow-up questions. Do all new lights also have those same defaults? And if you set the color to say, viz.RED, then do you get diffuse=[0.8,0,0], ambient=[0.5,0,0], and specular=[1,0,0]? What about the default headlight values for the three types of attenuation, spread, and intensity? And is setting a light's position, say light.position(0,1,0), the same as translating it with light.translate(0,1,0)?

[farshizzo]

Yes, all new lights default to these values. Setting the color of a light to viz.RED will set the diffuse to [1,0,0] and leave the ambient/specular alone. If you want to change those values then you can use the <node>.ambient and <node>.specular commands.

Here are the defaults for the other values:
spotexponent: 0.0
spread: 180
constant attenuation: 1
linear attenuation: 0
quadratic attenuation: 0
intensity: 1

Translating a light has the same effect as setting the position.