float Heightmap::getInterpolatedHeightAt(float x, float z) {
if(0.0f <= x && x <= 1.0f && 0.0f <= z && z <= 1.0f) {
int col1 = floor<int>(x * (float)(columns + 1));
int col2 = col1 + 1;
float dx = x * (float)(columns + 1) - (float)col1;
int row1 = floor<int>(z * (float)(rows + 1));
int row2 = row1 + 1;
float dz = z * (float)(rows + 1) - (float)row1;
float x1 = x - dx;
float x2 = x1 + 1.0f;
float z1 = z - dz;
float z2 = z1 + 1.0f;
float height = 0.0f;
if(dx + dz < 1) {
triangle_intersection(vec3(x1, getHeightAt(col1, row1), z1), vec3(x1, getHeightAt(col1, row2), z2), vec3(x2, getHeightAt(col2, row1), z1), vec3(x, 0, z), vec3(0, 1, 0), &height);
} else {
triangle_intersection(vec3(x2, getHeightAt(col2, row1), z1), vec3(x1, getHeightAt(col1, row2), z2), vec3(x2, getHeightAt(col2, row2), z2), vec3(x, 0, z), vec3(0, 1, 0), &height);
}
return height;
}
return 0.0f;
}
bool
Polygon::intersection(const Ray *ray,
IntersectionHelper *intersections)
{
for (int i = 1; i < m_verts.size()-1; ++i)
{
double beta, gamma;
if (triangle_intersection(ray, m_verts[0], m_verts[i], m_verts[i+1],
beta, gamma))
{
if (!intersections)
return true;
IntersectionData d;
d.u_tangent = m_verts[i+1] - m_verts[0];
Point2D uv0 = m_uvs[0];
Point2D uv1 = m_uvs[i];
Point2D uv2 = m_uvs[i+1];
d.uv[0] = (1-beta-gamma)*uv0[0] + beta*uv1[0] + gamma*uv2[0];
d.uv[1] = (1-beta-gamma)*uv0[1] + beta*uv1[1] + gamma*uv2[1];
Vector3D norm0, norm1, norm2;
if (m_normals.size() > 0)
norm0 = m_normals[0];
else
norm0 = m_normal;
if (m_normals.size() > i)
norm1 = m_normals[i];
else
norm1 = m_normal;
if (m_normals.size() > i+1)
norm2 = m_normals[i+1];
else
norm2 = m_normal;
d.normal = (1-beta-gamma)*norm0 + beta*norm1 + gamma*norm2;
d.t = (m_verts[0]-ray->get_pos()).dot(m_normal) /
(m_normal.dot(ray->get_dir()));
intersections->on_intersection(d);
return true;
}
}
return false;
}
std::shared_ptr<EETriangle> EditorScene::findTriangle(cocos2d::Vec2 rawpos)
{
float tmpOut;
auto ori = help_touchPoint2editPosition(rawpos);
ori = help_editPosition2relativePosition(ori);
for (auto tri : _triangles[_frameIndex]) {
if (triangle_intersection(tri->a->pos3d(), // Triangle vertices
tri->b->pos3d(),
tri->c->pos3d(),
Vec3{ori.x, ori.y, 5.0}, //Ray origin
Vec3{0.f,0.f,-1.f}, //Ray direction
&tmpOut)) {
return tri;
}
}
return nullptr;
}
