void
_set_default_sphere(Evas_Canvas3D_Mesh *mesh,
int frame,
int p,
Evas_Vec2 tex_scale)
{
int vcount, icount, vccount, i, j;
icount = p * p * 6;
vccount = p + 1;
vcount = vccount * vccount;
ALLOCATE_VERTEX_DATA
double dtheta, dfi, sinth, costh, fi, theta, sinfi, cosfi;
dtheta = M_PI / p;
dfi = 2 * M_PI / p;
for (j = 0; j < vccount; j++)
{
theta = j * dtheta;
sinth = sin(theta);
costh = cos(theta);
for (i = 0; i < vccount; i++)
{
fi = i * dfi;
sinfi = sin(fi);
cosfi = cos(fi);
normals[i + j * vccount].x = sinth * sinfi;
normals[i + j * vccount].y = sinth * cosfi;
normals[i + j * vccount].z = costh;
vertices[i + j * vccount].x = normals[i + j * vccount].x / 2;
vertices[i + j * vccount].y = normals[i + j * vccount].y / 2;
vertices[i + j * vccount].z = normals[i + j * vccount].z / 2;
tangents[i + j * vccount].x = -sinth * cosfi;
tangents[i + j * vccount].y = sinth * sinfi;
tangents[i + j * vccount].z = 0;
_primitives_vec3_normalize(&tangents[i + j * vccount]);
tex_coord[i + j * vccount].x = i / (float)(vccount - 1) * tex_scale.x;
tex_coord[i + j *vccount].y = tex_scale.y - j / (float)(vccount - 1) * tex_scale.y;
}
}
_generate_indices(indices, p, p);
SET_VERTEX_DATA(frame)
}
void
_set_cone_without_base(Evas_Canvas3D_Mesh *mesh,
int frame,
int p,
Eina_Vector2 tex_scale)
{
int vcount, icount, vccount, i;
double dfi, fi, sinfi, cosfi, nplane, nz;
icount = p * 6;
vccount = p + 1;
vcount = 2 * vccount;
dfi = 2.0 * M_PI / p;
nz = sqrt(1.0 / 3.0);
nplane = sqrt(2.0 / 3.0);
ALLOCATE_VERTEX_DATA
for (i = 0; i < vccount; i++)
{
fi = i * dfi;
sinfi = sin(fi);
cosfi = cos(fi);
vertices[i].x = sinfi / 2.0;
vertices[i].y = cosfi / 2.0;
vertices[i].z = -0.5;
vertices[i + vccount].x = 0;
vertices[i + vccount].y = 0;
vertices[i + vccount].z = 0.5;
normals[i + vccount].x = normals[i].x = sinfi * nplane;
normals[i + vccount].y = normals[i].y = cosfi * nplane;
normals[i + vccount].z = normals[i].z = nz;
tangents[i + vccount].x = tangents[i].x = cosfi;
tangents[i + vccount].y = tangents[i].y = -sinfi;
tangents[i + vccount].z = tangents[i].z = 0;
tex_coord[i].x = i / (float)(vccount - 1) * tex_scale.x;
tex_coord[i].y = 0;
tex_coord[i + vccount].x = tex_coord[i].x;
tex_coord[i + vccount].y = tex_scale.y;
}
_generate_indices(indices, p, 1);
SET_VERTEX_DATA(frame)
}
void
evas_model_set_from_torus_primitive(Evas_Canvas3D_Mesh *mesh,
int frame,
Evas_Real ratio,
int p,
Eina_Vector2 tex_scale)
{
int vcount, icount, vccount, i, j;
icount = p * p * 6;
vccount = p + 1;
vcount = vccount * vccount;
ALLOCATE_VERTEX_DATA
double d, sinth, costh, fi, theta, sinfi, cosfi;
d = 2 * M_PI / p;
float rratio;
if ((ratio < 1.0))
{
printf("Ratio of torus should be greater than or equal 1.0.\n");
printf("Ratio = %f is a bad value, so 3.0 is used like default ratio.\n",
ratio);
rratio = 1.0 / 3.0;
}
else
{
rratio = 1.0 / ratio;
}
for (j = 0; j < vccount; j++)
{
theta = j * d;
sinth = sin(theta);
costh = cos(theta);
for (i = 0; i < vccount; i++)
{
fi = i * d;
sinfi = sin(fi);
cosfi = cos(fi);
vertices[i + j * vccount].x = (1.0 - rratio + rratio * cosfi) * costh * 0.5;
vertices[i + j * vccount].y = (1.0 - rratio + rratio * cosfi) * sinth * 0.5;
vertices[i + j * vccount].z = rratio * sinfi * 0.5;
normals[i + j * vccount].x = cosfi * costh;
normals[i + j * vccount].y = cosfi * sinth;
normals[i + j * vccount].z = sinfi;
tangents[i + j * vccount].x = -sinfi * costh;
tangents[i + j * vccount].y = -sinfi * sinth;
tangents[i + j * vccount].z = cosfi;
_primitives_vec3_normalize(&normals[i + j * vccount]);
tex_coord[i + j * vccount].x = i / (float)(vccount - 1) * tex_scale.x;
tex_coord[i + j *vccount].y = tex_scale.y - j / (float)(vccount - 1) * tex_scale.y;
}
}
_generate_indices(indices, p, p);
SET_VERTEX_DATA(frame)
}
void
_set_sphere_with_alternative_uv(Evas_Canvas3D_Mesh *mesh,
int frame,
int p,
Evas_Vec2 tex_scale)
{
int vcount, icount, vccount, i, j;
vccount = p + 1;
vcount = vccount * vccount;
icount = p * p * 6;
ALLOCATE_VERTEX_DATA
/* Calculate vertices position of the sphere mesh by using
splitting of sphere by latitude and longitude. */
for (i = 0; i <= p; i++)
{
double lati, z, r, point_r;
point_r = 0.00001;//non-zero little value for correct tangents calculation.
lati = ((M_PI - 2 * point_r) * (double)i) / (double)p;
z = cos(lati + point_r);
r = fabs(sin(lati + point_r));
for (j = 0; j <= p; j++)
{
double longi;
int num = (i * (p + 1)) + j;
longi = (M_PI * 2.0 * (double)j) / (double)p;
normals[num].x = r * sin(longi);
normals[num].y = r * cos(longi);
normals[num].z = z;
vertices[num].x = normals[num].x / 2;
vertices[num].y = normals[num].y / 2;
vertices[num].z = normals[num].z / 2;
if (vertices[num].x > 0.0)
{
tangents[num].x = -normals[num].z;
tangents[num].y = normals[num].y;
tangents[num].z = normals[num].x;
}
else
{
tangents[num].x = normals[num].z;
tangents[num].y = normals[num].y;
tangents[num].z = -normals[num].x;
}
tex_coord[num].x = i / (float)(vccount - 1) * tex_scale.x;
tex_coord[num].y = tex_scale.y - j / (float)(vccount - 1) * tex_scale.y;
}
}
_generate_indices(indices, p, p);
/* Triangulation of sphere mesh in appliance with buffer of indices. */
for (i = 0; i < icount; i += 3)
{
Evas_Vec3 e1, e2;
float du1, du2, dv1, dv2, f;
Evas_Vec3 tangent;
int num0, num1, num2;
num0 = indices[i + 0];
num1 = indices[i + 1];
num2 = indices[i + 2];
e1.x = vertices[num1].x - vertices[num0].x;
e1.y = vertices[num1].y - vertices[num0].y;
e1.z = vertices[num1].z - vertices[num0].z;
e2.x = vertices[num2].x - vertices[num0].x;
e2.y = vertices[num2].y - vertices[num0].y;
e2.z = vertices[num2].z - vertices[num0].z;
du1 = tex_coord[num1].x - tex_coord[num0].x;
dv1 = tex_coord[num1].y - tex_coord[num0].y;
du2 = tex_coord[num2].x - tex_coord[num0].x;
dv2 = tex_coord[num2].y - tex_coord[num0].y;
f = 1.0 / ((du1 * dv2) - (du2 * dv1));
tangent.x = f * ((dv2 * e1.x) - (dv1 * e2.x));
tangent.y = f * ((dv2 * e1.y) - (dv1 * e2.y));
tangent.z = f * ((dv2 * e1.z) - (dv1 * e2.z));
tangents[num0] = tangent;
}
/* Coupling between vertices by calculation of tangent parametr correct value. */
for (i = 0; i <= p; i++)
{
for (j = 0; j <= p; j++)
{
if (j == p)
{
tangents[(i * (p + 1)) + j] = tangents[i * (p + 1)];
}
}
}
SET_VERTEX_DATA(frame)
}
void
_set_default_cone(Evas_Canvas3D_Mesh *mesh,
int frame,
int p,
Eina_Vector2 tex_scale)
{
int vcount, icount, vccount, i, j, num;
double dfi, fi, sinfi, cosfi, nplane, nz;
icount = p * 18;
vccount = p + 1;
vcount = 4 * vccount;
dfi = 2.0 * M_PI / p;
nz = sqrt(1.0 / 3.0);
nplane = sqrt(2.0 / 3.0);
ALLOCATE_VERTEX_DATA
for (i = 0; i < vccount; i++)
{
fi = i * dfi;
sinfi = sin(fi);
cosfi = cos(fi);
vertices[i].x = 0.0;
vertices[i].y = 0.0;
vertices[i].z = -0.5;
vertices[i + vccount].x = sinfi / 2.0;
vertices[i + vccount].y = cosfi / 2.0;
vertices[i + vccount].z = -0.5;
vertices[i + 2 * vccount] = vertices[i + vccount];
vertices[i + 3 * vccount].x = 0.0;
vertices[i + 3 * vccount].y = 0.0;
vertices[i + 3 * vccount].z = 0.5;
normals[i].x = normals[i].y = 0.0;
normals[i].z = -1.0;
normals[i + vccount] = normals[i];
normals[i + 2 * vccount].x = sinfi * nplane;
normals[i + 2 * vccount].y = cosfi * nplane;
normals[i + 2 * vccount].z = nz;
normals[i + 3 * vccount] = normals[i + 2 * vccount];
for (j = 0; j < 4; j++)
{
num = i + j * vccount;
tangents[num].x = cosfi;
tangents[num].y = -sinfi;
tangents[num].z = 0.0;
tex_coord[num].x = i / (float)(vccount - 1) * tex_scale.x;
tex_coord[num].y = (float)((j + 1) / 2) * tex_scale.y / 2.0;
}
}
_generate_indices(indices, p, 3);
SET_VERTEX_DATA(frame)
}
