void ZoaDebugFunctions::addQuadToMesh( ci::TriMesh& mesh, const ci::Vec3f& P0, const ci::Vec3f& P1, const ci::Vec3f& P2, const ci::Vec3f& P3, const ci::ColorA& color )
{
ci::Vec3f e0 = P2 - P0;
ci::Vec3f e1 = P2 - P1;
ci::Vec3f n = e0.cross(e1).normalized();
mesh.appendVertex( P0 );
mesh.appendColorRGBA( color );
mesh.appendNormal( n );
mesh.appendVertex( P1 );
mesh.appendColorRGBA( color );
mesh.appendNormal( n );
mesh.appendVertex( P2 );
mesh.appendColorRGBA( color );
mesh.appendNormal( n );
mesh.appendVertex( P3 );
mesh.appendColorRGBA( color );
mesh.appendNormal( n );
int vert0 = mesh.getNumVertices() - 4;
int vert1 = mesh.getNumVertices() - 1;
int vert2 = mesh.getNumVertices() - 2;
int vert3 = mesh.getNumVertices() - 3;
mesh.appendTriangle( vert0, vert3, vert1 );
mesh.appendTriangle( vert3, vert2, vert1 );
}
void World::generateMesh(ci::TriMesh & mesh)
{
using namespace ci;
Vec3f offset = Vec3f(m_size * -0.5f, m_size * -0.5f, m_size * -0.5f);
for (size_t z = 0; z < m_size; ++z)
for (size_t y = 0; y < m_size; ++y)
for (size_t x = 0; x < m_size; ++x)
{
if (cell(x, y, z) == AIR)
{
for (size_t i = 0; i < 6; ++i)
{
int index = getNeigbour(x, y, z, i);
if (index != -1)
{
if (cell(index) == DIRT)
{
Vec3f normal = getNeigbourOffset(i);
Vec3f up = std::abs(normal.dot(Vec3f::yAxis())) > 0.9f ? Vec3f::zAxis() : Vec3f::yAxis();
Vec3f side = normal.cross(up) * 0.5f;
up = up * 0.5f;
Vec3f pos = offset + Vec3f(x, y, z) + (normal * 0.5f);
size_t indexStart = mesh.getNumVertices();
// Layout of the quad
//
// 0 --------------- 3
// | ^ up |
// | | |
// | side | |
// | <-----o pos |
// | |
// | |
// | |
// 1 --------------- 2
// Create the vertex data
mesh.appendVertex(pos + side + up);
mesh.appendVertex(pos + side - up);
mesh.appendVertex(pos - side - up);
mesh.appendVertex(pos - side + up);
mesh.appendNormal(-normal);
mesh.appendNormal(-normal);
mesh.appendNormal(-normal);
mesh.appendNormal(-normal);
// Create triangle data
mesh.appendTriangle(indexStart + 0, indexStart + 1, indexStart + 2);
mesh.appendTriangle(indexStart + 0, indexStart + 2, indexStart + 3);
}
}
}
}
}
}