Nebula
This effect generates a nebula by rendering a textured 3D rectangle. The texture controls allow a wide variety of looks from ringed nebulas to sparse mottled nebulas. Use the orientation and viewing distance controls to give the nebula a true 3D appearance.
An example Nebula dialog.
High Frequency Noise | This controls which noise function is used as a basis for the nebula. Checking this box yields a nebula with much higher frequencies and works best when applied in small rectangles multiple times. Clearing this box yields a smoother nebula and works better when applied as a single large rectangle. When the box is checked it is equivalent to the Nebula function in the Universe Image Creator stand alone application. |
Dropoff | Controls rate of falloff of nebula to empty space. Larger values result in a faster falloff. |
Intensity | Controls coverage of nebula texture. Larger values result in more coverage. |
Color Frequency | Controls repetition of inner and outer color from the center of the region. Larger values result in more repetitions. Larger values can be used to simulate the appearance of novas or ringed nebulas. |
Smoothness | Controls the 'smoothness' of the fractal noise used to control the shape of the nebula. Smaller values make the nebula more mottled. |
Inner Color, Outer Color | Controls the colors used in rendering the nebula. The inner color is used nearest the center of the nebula. This color is mixed with the outer color as a function of the distance from the nebula center. |
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