Triangle::Triangle(Point3D p1, Point3D p2, Point3D p3, Texture* texture) :
Primitive() {
this->p1 = p1;
this->p2 = p2;
this->p3 = p3;
this->s = 0;
this->t = 0;
this->texture = texture;
vector<Point3D> points;
points.push_back(this->p1);
points.push_back(this->p2);
points.push_back(this->p3);
normal = calculateSurfaceNormal(points);
// start calculating texture points
// sides length of triangle
float a, b, c;
a = sqrt(
pow(p1.getX() - p3.getX(), 2) + pow(p1.getY() - p3.getY(), 2)
+ pow(p1.getZ() - p3.getZ(), 2));
b = sqrt(
pow(p2.getX() - p1.getX(), 2) + pow(p2.getY() - p1.getY(), 2)
+ pow(p2.getZ() - p1.getZ(), 2));
c = sqrt(
pow(p3.getX() - p2.getX(), 2) + pow(p3.getY() - p2.getY(), 2)
+ pow(p3.getZ() - p2.getZ(), 2));
// cosine internal angles of triangle
float alpha, c_SinAlpha, b_cCosAlpha;
alpha = (pow(b, 2) + pow(c, 2) - pow(a, 2)) / (2 * b * c);
b_cCosAlpha = b - c * alpha;
c_SinAlpha = sqrt(pow(a, 2) - pow(b_cCosAlpha, 2));
P0 = Point2D(b_cCosAlpha, c_SinAlpha);
P1 = Point2D(0, 0);
P2 = Point2D(b, 0);
if (texture) {
this->s = P2.getX() / texture->getTexLenght_s();
this->t = P0.getY() / texture->getTexLenght_t();
P2.setX(s);
P0 = Point2D(s / 2, t);
}
}
void GeometryTerrain::addTri(TriType type_, const glm::vec3& a_rv0, const glm::vec3& a_rv1, const glm::vec3& a_rv2, const glm::vec4& a_colour, const int& triNum_)
{
if (type_ == TRI_TERRAIN)
{
if (sm_singleton->terrainTriCount < sm_singleton->maxTerrainTris)
{
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v0.x = a_rv0.x;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v0.y = a_rv0.y;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v0.z = a_rv0.z;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v0.w = 1;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v1.x = a_rv1.x;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v1.y = a_rv1.y;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v1.z = a_rv1.z;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v1.w = 1;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v2.x = a_rv2.x;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v2.y = a_rv2.y;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v2.z = a_rv2.z;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v2.w = 1;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v0.r = a_colour.r;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v0.g = a_colour.g;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v0.b = a_colour.b;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v0.a = 1;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v1.r = a_colour.r;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v1.g = a_colour.g;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v1.b = a_colour.b;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v1.a = 1;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v2.r = a_colour.r;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v2.g = a_colour.g;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v2.b = a_colour.b;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v2.a = 1;
if (triNum_ <= 0)
{
//set vertex UV's
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v0.s = 0;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v0.t = 0;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v1.s = 0;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v1.t = 1;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v2.s = 1;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v2.t = 1;
}
if (triNum_ >= 1)
{
//set vertex UV's
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v0.s = 0;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v0.t = 0;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v1.s = 1;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v1.t = 1;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v2.s = 1;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v2.t = 0;
}
//add surface normals
glm::vec4 n = calculateSurfaceNormal(a_rv0, a_rv1, a_rv2);
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v0.nx = n.x;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v0.ny = n.y;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v0.nz = n.z;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v0.nw = 1;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v1.nx = n.x;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v1.ny = n.y;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v1.nz = n.z;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v1.nw = 1;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v2.nx = n.x;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v2.ny = n.y;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v2.nz = n.z;
sm_singleton->terrainTris[sm_singleton->terrainTriCount].v2.nw = 1;
sm_singleton->terrainTriCount++;
}
}
else if (type_ == TRI_PLAIN)
{
sm_singleton->plainTris[sm_singleton->plainTriCount].v0.x = a_rv0.x;
sm_singleton->plainTris[sm_singleton->plainTriCount].v0.y = a_rv0.y;
sm_singleton->plainTris[sm_singleton->plainTriCount].v0.z = a_rv0.z;
sm_singleton->plainTris[sm_singleton->plainTriCount].v0.w = 1;
sm_singleton->plainTris[sm_singleton->plainTriCount].v1.x = a_rv1.x;
sm_singleton->plainTris[sm_singleton->plainTriCount].v1.y = a_rv1.y;
sm_singleton->plainTris[sm_singleton->plainTriCount].v1.z = a_rv1.z;
sm_singleton->plainTris[sm_singleton->plainTriCount].v1.w = 1;
sm_singleton->plainTris[sm_singleton->plainTriCount].v2.x = a_rv2.x;
sm_singleton->plainTris[sm_singleton->plainTriCount].v2.y = a_rv2.y;
sm_singleton->plainTris[sm_singleton->plainTriCount].v2.z = a_rv2.z;
sm_singleton->plainTris[sm_singleton->plainTriCount].v2.w = 1;
sm_singleton->plainTris[sm_singleton->plainTriCount].v0.r = a_colour.r;
sm_singleton->plainTris[sm_singleton->plainTriCount].v0.g = a_colour.g;
sm_singleton->plainTris[sm_singleton->plainTriCount].v0.b = a_colour.b;
sm_singleton->plainTris[sm_singleton->plainTriCount].v0.a = 1;
sm_singleton->plainTris[sm_singleton->plainTriCount].v1.r = a_colour.r;
sm_singleton->plainTris[sm_singleton->plainTriCount].v1.g = a_colour.g;
sm_singleton->plainTris[sm_singleton->plainTriCount].v1.b = a_colour.b;
sm_singleton->plainTris[sm_singleton->plainTriCount].v1.a = 1;
sm_singleton->plainTris[sm_singleton->plainTriCount].v2.r = a_colour.r;
sm_singleton->plainTris[sm_singleton->plainTriCount].v2.g = a_colour.g;
sm_singleton->plainTris[sm_singleton->plainTriCount].v2.b = a_colour.b;
sm_singleton->plainTris[sm_singleton->plainTriCount].v2.a = 1;
sm_singleton->plainTriCount++;
}
}
