|
|
// Declarations of functions implemented in
// plant.c
#include "H:/vsfx705/C/lib/library.h"
typedef struct {
float pixels;
unsigned seed;
int leafCount;
int leafCv;
float leafBase,
leafTip;
vector leafRGB;
float leafX, leafY;
float leafDroop;
}PlantDB;
void leaf(PlantDB plant, vector end);
vector* subdivide(unsigned seed, int num, vector B, vector E, float falloff);
#include "plant.h"
#include <stdio.h>
#include <math.h>
void leaf(PlantDB plant, vector end)
{
int n, segments = (plant.leafCv - 1)/3 + 1;
// Generate some xyz's using our subdivide routine
vector begin = {0,0,0};
vector *cv = subdivide(plant.seed,plant.leafCv, begin, end, plant.leafDroop);
/* "open" the Curves statement */
printf("Curves \"cubic\" [%d] \"nonperiodic\" \"P\" [", plant.leafCv);
/* add the list of cv's */
for(n = 0; n < plant.leafCv; n++)
printf("%f %f %f ", cv[n].x, cv[n].y, cv[n].z);
/* varying widths */
printf("] \"width\" [");
for(n = 0; n < segments; n++)
printf("%f ", flerp(plant.leafBase, plant.leafTip, (float)n/(segments - 1)));
printf("] \n");
/* add the list of colors */
printf("\"Cs\" [");
for(n = 0; n < segments - 1; n++)
printf("%f %f %f ", randBetween(plant.leafRGB.x, 1),
randBetween(plant.leafRGB.y, 1),
randBetween(plant.leafRGB.z,plant.leafRGB.z*2));
printf("1 1 1]\n"); // white leaf tip
printf("\"N\" [");
for(n = 0; n < segments; n++)
printf("%f %f %f ", randBetween(0,1),
randBetween(0,1),
randBetween(0,1));
printf("]\n");
}
//_____________________________________________________
vector* subdivide(unsigned seed, int num, vector B, vector E, float falloff)
{
vector end = subtract(E, B);
static vector pnt[256];
vector temp;
float u, variation = randBetween(0.5,1);
int n;
for(n = 0; n < num; n++)
{
u = (float) n/num;
temp = scalar(add(end, B), u);
temp.y = temp.y - (temp.y * pow(u, falloff) * variation);
pnt[n] = temp;
}
return pnt;
}
|
|
| |
A fully randomized plant, ready for animation (if possilble). The core function of the palm generator takes data about color thickness size, etc and uses it to calculate, draw, apply thickness, and render the curves. Specifically, the function takes in the detail of each plant based on screen size, a random seed number based on the name of each poly cube, the numbner of cvs for each curve, the number of leaves, the width of base and tip, the primary colors for the leaves (randomness adde within the script) the x and y scale of the plant, and finally the amount of droop, or gravity, it experiences. The program then constructs a rib statement MTOR can understand and execute, one piece at a time. Mike figured our how to set, then randomize the normals, resulting in an interesting twisting effect on the leaves. This also locks the leaves into postion, allowing the camera to rotate around them, as shown by the animation below (COURTESY OF MIKE CABRERA) : |
|
|
