Water Displacement Shader Part One

Sine Wave Displacement Testing
A renderman shader was written and applied to a polygonal plane in Maya.  60 frames were rendered in Renderman and also in Maya MTOR.  Notice that in Maya the settings will have to be modified to get the same level of detail that you can accomplish
within renderman.

Movies

Rendered with PRMAN

Rendered with Maya MTOR

Process

Shader Settings in Maya MTOR:
Using the lerp function, the frequency of the waves was animated.

Shader Code:

displacement
basic_wave(float Km = -0.3,
sfreq = 1,
tfreq = 1,
phase = 1,
offset = 0,
turb = .3 )
{
float hump = 0;
normal n;

n = normalize(N);

float waviness = noise(P) * turb;
hump = sin((s + phase + waviness) * 2 * PI * sfreq) + offset;/*hump = hump + sin((t + phase) * 2 * PI * tfreq) + offset;*/
P = P - n * hump * Km;

N = calculatenormal(P);
}

Adding More Detail - Rendered in Maya MTOR

Lights were added along with the modification of the shader to add multiple levels of detail in the ripples of the water.
 Additionally, two separate coordinate systems are used to generate movement through the water.
To Do: I am still troubleshooting the flashes of light that appear on the surface.....

Adding multiple levels of noise

#include "H:/rman/shaders/wave/getWaveHt.h"

displacement
basic_wave(float 
Km = -0.3,/* height of the entire wave */
tKm = 1,/* height of the turb ONLY */
wKm = 1,/* height of the wave ONLY */
sfreq = 1,/* number of waves in the s direction */
phase01 = 1,/* movement of the wave in the s dir */
phase02 = 1,
offset = 0,		
waviness = .3,/* curviness of the crest of the wave */	
nfreq = 3,/* freq of the turb */
detail = 3;/* richness of the details of the turb */
string	wavesys = "object",
	turbsys = "object")		
{
float	hump = 0;
normal	n;
point	pp = transform(wavesys, P);
point	ppp = transform(turbsys, P);


n = normalize(N);


hump = getWaveHt(pp, s, sfreq,
	   phase01, waviness) * wKm;
hump = hump + turbulence(ppp,
	   detail, nfreq) * tKm;

P = P - n * hump * Km;


N = calculatenormal(P);
}
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