From: ÀÌ»óà (vaper3++at++dreamwiz.com)
Date: 08/04/2001 03:01:28
Hello !
I'm a new user of performer.
I'm trying to convert OpenGl code drawing ellipsoid to Performer.
But I can't do this. Please help me.
Here is my OpenGl cord(In MS C++).
---------------------------------------------Begin
void Ellipse3D(float a, float b, float c);
void Ellipse3D(float a, float b, float c)
{
float PI =3.141593f;
float x2 = 0.0f, y2 = 0.0f, z2 = 0.0f, d2 = 0.0f;
float x1 = 0.0f, y1 = 0.0f, z1 = 0.0f, d1 = 0.0f;
int step = 2;
int slice = 20;
float phi = PI/slice;
z1 = c;
d1 = 0;
for(int i=step; i<=slice; i+=step)
{
z2 = c*cos(i*phi);
d2 = sqrt(1-pow(z2/c,2));
glBegin(GL_QUAD_STRIP);
for(int j=2*slice; j>=0; j-=step)
{
glNormal3f(cos(phi*j)*sin(phi*i), sin(phi*j)*sin(phi*i), cos(phi*i));
glVertex3f(a*d2*cos(phi*j), b*d2*sin(phi*j), z2);
glNormal3f(cos(phi*j)*sin((i-step)*phi), sin(phi*j)*sin((i-step)*phi), cos((i-step)*phi));
glVertex3f(a*d1*cos(phi*j), b*d1*sin(phi*j), z1);
}
glEnd();
z1 = z2;
d1 = d2;
}
---------------------------------------------------------End
And my performer sorce (based on gset.C)
-------------------------------------------------------Begin
#include <Performer/pr/pfWindow.h>
#include <Performer/pr/pfGeoSet.h>
#include <Performer/pr/pfGeoState.h>
#include <Math.h>
int main (void)
{
float t = 0.0f;
// Initialize Performer
pfInit();
pfInitState(NULL);
// Initialize GL
pfWindow *win = new pfWindow;
win->setOriginSize(100, 100, 500, 500);
win->setName("OpenGL Performer");
win->setWinType(PFWIN_TYPE_X);
win->open();
// set up the window
pfFrustum *frust = new pfFrustum;
frust->apply();
delete frust;
pfAntialias(PFAA_ON);
pfCullFace(PFCF_OFF);
// Set up a geoset
pfVec3 *coords = new pfVec3[2];
pfVec3 *norms = new pfVec3[2];
int vertex_coun=0t;
float a = 5;
float b = 5;
float c = 5;
float PI =3.141593f;
float x2 = 0.0f, y2 = 0.0f, z2 = 0.0f, d2 = 0.0f;
float x1 = 0.0f, y1 = 0.0f, z1 = 0.0f, d1 = 0.0f;
int step = 2;
int slice = 20;
float phi = PI/slice;
z1 = c;
d1 = 0;
for(int i=step; i<=slice; i+=step)
{
z2 = c*cos(i*phi);
d2 = sqrt(1-pow(z2/c,2));
for(int j=2*slice; j>=0; j-=step)
{
norms(vertex_count).set(cos(phi*j)*sin(phi*i), sin(phi*j)*sin(phi*i), cos(phi*i));
coords(vertex_count).set(a*d2*cos(phi*j), b*d2*sin(phi*j), z2);
norms(vertex_count).set(cos(phi*j)*sin((i-step)*phi), sin(phi*j)*sin((i-step)*phi), cos((i-step)*phi));
coords(vertex_count).set(a*d1*cos(phi*j), b*d1*sin(phi*j), z1);
vertex_count++;
}
z1 = z2;
d1 = d2;
}
pfVec4 *colors = new pfVec4[4];
colors[0].set(1.0f, 1.0f, 1.0f, 1.0f);
colors[1].set(0.0f, 0.0f, 1.0f, 1.0f);
colors[2].set(1.0f, 0.0f, 0.0f, 1.0f);
colors[3].set(0.0f, 1.0f, 0.0f, 1.0f);
pfGeoSet *gset = new pfGeoSet;
gset->setAttr(PFGS_COORD3, PFGS_PER_VERTEX, coords, NULL);
gset->setAttr(PFGS_COLOR4, PFGS_PER_VERTEX, colors, NULL);
gset->setAttr(PFGS_NORMAL3, PFGS_PER_VERTEX, norms, NULL);
gset->setPrimType(PFGS_TRISTRIPS);
gset->setNumPrims(vertex_count);
// Set up a geostate, backface removal turned off
pfGeoState *gstate = new pfGeoState;
gstate->setMode(PFSTATE_CULLFACE, PFCF_OFF);
gset->setGState(gstate);
pfTranslate (0.0f, 0.0f, -4.0f);
// Simulate for twenty seconds.
pfInitClock (0.0f);
while (t < 20.0f)
{
static pfVec4 clr(0.1f, 0.0f, 0.4f, 1.0f);
t = pfGetTime();
pfClear(PFCL_COLOR | PFCL_DEPTH, &clr);
pfRotate (PF_Y, 1.0f);
gset->draw();
win->swapBuffers();
}
return 0;
}
-------------------------------------------------------End
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