Using The IFW2_Water Textures

The DripDrop Texture
The Rain and DripDrop textures both share a common set of parameters. These define the start and end parameters from the ripple wavelength, the ripple radius and the number of ripples. Both textures also have a time parameter called Distance. This parameter controls the overall animation and should be morphed from 0% to 100% to complete one animation cycle. The animation for both textures is cyclic and can therefore be looped. The wavelength, radius and ripple control are all morphed between the minimum and maximum values over time. This means that each parameter starts at its minimum value when the Distance is 0% and end at maximum value when the Distance is 100%.

The Minimum and Maximum Wavelength Parameters
The Minimum and Maximum WaveLengths determine the starting and ending wavelengths, respectively. The wavelength defines the period of the wave used for the ripples. That is, the distance between the ripple peaks. Basically, the larger these values the bigger the distance between the waves. The pictures, below, show the effect of increasing the Maximum WaveLength on the Drip Drop texture. Here, the Min/Max Radii have both been set to 8.0 and the Min/Max Ripples to 4.0.
Distance
0% 20% 40% 60% 80%
Minimum WaveLength = 0.0
Maximum WaveLength = 1.0
Minimum WaveLength = 0.0
Maximum WaveLength = 4.0
Minimum WaveLength = 0.0
Maximum WaveLength = 8.0
Minimum WaveLength = 0.0
Maximum WaveLength = 16.0

The Minimum and Maximum Radius Parameters
The Minimum and Maximum Radii determine the starting and ending radii, respectively. The radius defines the radius is the outer ripple ring. The pictures, below, show the effect of increasing the Maximum Radius on the Drip Drop texture. Here, the Min/Max WaveLengths have both been set to 4.0 and the Min/Max Ripples to 4.0.
Distance
0% 20% 40% 60% 80%
Minimum Radius = 0.0
Maximum Radius = 1.0
Minimum Radius = 0.0
Maximum Radius = 4.0
Minimum Radius = 0.0
Maximum Radius = 8.0
Minimum Radius = 0.0
Maximum Radius = 16.0

The Minimum and Maximum Ripples Parameters
The Minimum and Maximum Ripples determine the starting and ending ripples respectively. The ripples defines the number of peaks or rings the pattern will have. The pictures, below, show the effect of increasing the Maximum Radius on the Drip Drop texture. Here, the Min/Max WaveLengths have both been set to 4.0 and the Min/Max Radii to 8.0.
Distance
0% 20% 40% 60% 80%
Minimum Ripples = 0.0
Maximum Ripples = 1.0
Minimum Ripples = 0.0
Maximum Ripples = 4.0
Minimum Ripples = 0.0
Maximum Ripples = 8.0
Minimum Ripples = 0.0
Maximum Ripples = 16.0

The Rain Texture
The Rain texture is basically a series of drip drops. There are, however, several new parameters, in addition to the ones above, that control the look of the rain. These are Spread, Number Of Drops, Min/Max Life and Random Seed. Again, the animation is cyclic and can be looped. The basic rain setup is shown below:
Distance
0% 20% 40% 60% 80%
WaveLength = 0.0 to 2.0
Radius = 2.0 to 5.0
Ripples = 2.0 to 8.0

The Spread Parameter
The Spread Parameter controls the area over which the drops will fall. This is basically a square area defined by the spread parameter with the texture axis at the center of the square. Therefore, the larger the Spread parameter the wider the area over which the drops fall. This is shown in the image below. Here, the basic Rain parameters are used but the spread parameter is increased.
Distance
0% 20% 40% 60% 80%
Spread = 1.0
Spread = 4.0
Spread = 8.0
Spread = 16.0

The Number Of Drops Parameter
The Number Of Drops Parameter controls the number of rain drop that fall in the animation. Therefore, the larger the Number Of Drops parameter the heavier the rain. This is shown in the images below. Here, the basic Rain parameters are used but the Number Of Drops parameter is increased.
Distance
0% 20% 40% 60% 80%
Number Of Drops = 1.0
Number Of Drops = 4.0
Number Of Drops = 8.0
Number Of Drops = 16.0

The Minimum and Maximum Life Parameters
The Minimum and Maximum Life parameters determine the life of each drop. Basically, each drop has a life, that is, the time it takes to drop, ripple out and disperse back to nothing. With the life at 1.0 this will take N frames to do. If the life is reduced to say 0.5 then the drop will last half the number of frames (N/2 frames). Therefore, by reducing the Life parameter the drops speed up and disperse much quicker. This is should in the images below. Here, the basic Rain parameters are used but the Minimum and Maximum Life parameters are increased.
Distance
0% 20% 40% 60% 80%
Minimum Life = 0.25
Maximum Life = 0.25
Minimum Life = 0.5
Maximum Life = 0.5
Minimum Life = 0.75
Maximum Life = 0.75
Minimum Life = 1.0
Maximum Life = 1.0

The Random Seed Parameter
The Random Seed parameter is simply a seed for the pattern of the drops. By changing this value you get a different spread of drops with a completely different pattern. This is should in the image below. Here, the basic Rain parameters are used but the Random Seed is changed. Each image is shown with the distance set to 50%.
Seed
1762 2345 4431 2799 8134
WaveLength = 0.0 to 2.0
Radius = 2.0 to 5.0
Ripples = 2.0 to 8.0
Distance = 50%


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