void makeSphere(GeometryBatch &b, float radius, int divisions,
bool normals, bool uvs, const LColor *color)
{
b.init(GL_TRIANGLES, "sphere");
b.ps.clear();
b.uvs[0].clear();
// 0, 45, 90, 135, 180
// 0 1 2 3 4 45
for (int i = 1; i < divisions-1; ++i)
{
float e0 = c_LPI * ((float)i / (float)divisions) - c_LPI / 2.0f;
float e1 = c_LPI * (float)(i+1) / (float)divisions - c_LPI / 2.0f;
for (int j = 0; j < divisions; ++j)
{
float a0 = 2.0f * c_LPI * (float)j / (float)divisions;
float a1 = 2.0f * c_LPI * (float)(j+1) / (float)divisions;
// cout << "(e=" << LDegrees(e0) << ",a=" << LDegrees(a0) << ") => " << pointOnSphere(radius, e0, a0) << "\n";
b.ps.push_back(pointOnSphere(radius, e0, a0));
b.ps.push_back(pointOnSphere(radius, e0, a1));
b.ps.push_back(pointOnSphere(radius, e1, a0));
b.ps.push_back(pointOnSphere(radius, e1, a0));
b.ps.push_back(pointOnSphere(radius, e0, a1));
b.ps.push_back(pointOnSphere(radius, e1, a1));
if (uvs)
{
float a0n = normalizeAzimuth(a0);
float a1n = normalizeAzimuth(a1);
float e0n = normalizeElevation(e0);
float e1n = normalizeElevation(e1);
b.uvs[0].push_back(UV(a0n,e0n));
b.uvs[0].push_back(UV(a1n,e0n));
b.uvs[0].push_back(UV(a0n,e1n));
b.uvs[0].push_back(UV(a0n,e1n));
b.uvs[0].push_back(UV(a1n,e0n));
b.uvs[0].push_back(UV(a1n,e1n));
}
}
}
if (normals)
{
for (int n = 0; n < b.ps.size(); ++n)
{
b.ns.push_back(LNormal(b.ps[n] - LPoint(0,0,0)));
}
}
if (color)
{
b.cs.assign(b.ps.size(), *color);
}
// ostream_iterator<LPoint> osi(cout, "\n");
// copy(b.ps.begin(), b.ps.end(), osi);
}
void Particle_SphereSpread(ParticleSystem* psystem, float maxRadius, Vec3 emitterPos) {
u16 n = psystem->n_particles;
for (u16 i = 0; i < n; i++) {
float altitude = RandRange(0, M_PI);
float azimuth = RandRange(0, 2*M_PI);
float radius = RandRange(0.1f, maxRadius);
float sinAlt = sin(altitude);
float x = sinAlt * cos(azimuth);
float y = sinAlt * sin(azimuth);
float z = cos(altitude);
Vec3 pointOnSphere(x, y, z);
Vec3 pos = pointOnSphere*radius + emitterPos;
f32 speed = RandRange(3, 6);
Vec3 vel = pointOnSphere * speed;
psystem->positions[i] = pos;
psystem->velocities[i] = vel;
}
}