“Water” is a parametric texture.
The Water texture procedure is a parametric texture used to produce water effects. If used as a Bump or Displacement map, the result resembles water waves or ripples. Water waves consist of linear sine waves, whereas water ripples correspond to concentric rings originating from a drop.
| Argument Name | Absolute Range | Useful Range | Default | Description |
| reflection_boundary | TRUE FALSE | FALSE | Flag to reflect ripples at reflection boundary | |
| umin | -infinity, infinity | -5, 5 | 0.0 | Extent of reflection boundary |
| umax | -infinity, infinity | -5, 5 | 1.0 | " " " |
| vmin | -infinity, infinity | -5, 5 | 0.0 | " " " |
| vmax | -infinity, infinity | -5, 5 | 1.0 | " " " |
| ripple_drop_size | 0, infinity | 0, 1 | 0.3 | Width before drop off of envelope amplitude |
| ripple_frequency | 0, infinity | 0, 50 | 25.0 | Number of wavelengths of modulated sinewave per unit length |
| ripple_phase_velocity | 0, infinity | 0, 10 | 2.5 | Velocity of modulated sinewave |
| ripple_group_velocity | 0, infinity | 0, 10 | 1.0 | Envelope velocity |
| ripple_spread_start | 0, infinity | 0, 1 | 0.005 | Spread of envelope at ripple_time zero |
| ripple_spread_rate | 0, infinity | 0, 1 | 0.3 | Rate of spread increase with time |
| ripple_amplitude | -infinity, infinity | -1, 1 | 0.05 | Amplitude scaling factor of ripple |
| ripple_u_origin | -infinity, infinity | 0, 1 | 0.5 | Start point position |
| ripple_v_origin | -infinity, infinity | 0, 1 | 0.5 | " " " |
| ripple_time | -infinity, infinity | 0, 100 | 0.0 | Time variable for concentric waves |
| numwaves | 0, infinity | 0, 64 | 8 | Number of linear waves |
| sub_frequency | 0, infinity | 0, 1 | 0.125 | Frequency increment for successive waves |
| wind_u | -infinity, infinity | -5, 5 | 1.0 | Wind direction vector |
| wind_v | -infinity, infinity | -5, 5 | 0.0 | " " " |
| frequency | 0, infinity | 0, 20 | 4.0 | Wavenumber of fundamental frequency |
| wave_velocity | 0, infinity | 0, 5 | 1.0 | Velocity of fundamental frequency |
| wave_amplitude | -infinity, infinity | 0, 1 | 0.05 | Scaling factor for wave amplitudes |
| smoothness | ;0, infinity | 0, 5 | 2.0 | Rate of dropoff of amplitude with frequency |
| wave_time | -infinity, infinity | 0, 10 | 0.0 | Time variable for linear waves |
| urepeat | -infinity, infinity | -10.0, 10.0 | 1.0 | # of copies in u direction within coverage area. |
| vrepeat | -infinity, infinity | -10.0, 10.0 | 1.0 | # of copies in v direction within coverage area. |
| uoffset | -infinity, infinity | -1.0, 1.0 | 0.0 | U offset repeat within coverage area |
| voffset | -infinity, infinity | -1.0, 1.0 | 0.0 | V offset repeat within coverage area |
| ucoverage | -infinity, infinity | 0.0, 1.0 | 1.0 | amount of U surface to be textured |
| vcoverage | -infinity, infinity | 0.0, 1.0 | 1.0 | amount of V surface to be textured |
| utranslate | -infinity, infinity | -1.0, 1.0 | 0.0 | amount of U coverage area to be moved. |
| vtranslate | -infinity, infinity | -1.0, 1.0 | 0.0 | amount of V coverage area to be moved. |
| uwrap | TRUE FALSE | TRUE | flag to wrap texture around U boundaries of coverage area. | |
| vwrap | TRUE FALSE | TRUE | flag to wrap texture around U boundaries of coverage area. | |
| worldspace | TRUE FALSE | FALSE | flag to use world space texture mapping | |
| rotate | -infinity, infinity | -360.0, 360.0 | 0.0 | angle coverage area to be rotated |
| mirror | TRUE FALSE | FALSE | flag to match edges of texture |
