Method InitCornea

SampleFramework11/v1.02/Graphics/Model.cpp:484–631

Initializes the mesh as a plane

// Initializes the mesh as a plane
void Mesh::InitCornea(ID3D11Device* device, uint32 materialIdx)
{
    const float R = 5.5f;
    const float IrisDepth = 2.18f;

    const uint64 XRes = 100;
    const uint64 YRes = 100;
    const uint64 NumVerts = XRes * YRes;
    const uint64 NumTriangles = (XRes - 1) * (YRes - 1) * 2;
    const uint64 NumIndices = NumTriangles * 6;
    StaticAssert_(NumVerts <= UINT32_MAX);

    std::vector<Vertex> corneaVerts(NumVerts);
    std::vector<uint32> corneaIndices(NumIndices, 0);

    uint64 vIdx = 0;
    for(uint64 yIdx = 0; yIdx < YRes; ++yIdx)
    {
        for(uint64 xIdx = 0; xIdx < XRes; ++xIdx)
        {
            const float u = xIdx / (XRes - 1.0f);
            const float v = yIdx / (YRes - 1.0f);
            const float x = (u * 2.0f - 1.0f) * R;
            const float y = (v * 2.0f - 1.0f) * R;
            const float r = std::min(std::sqrt(x * x + y * y), R);
            const float z = CorneaZ(r);

            const float uStep = 1.0f / (XRes - 1.0f);
            const float vStep = 1.0f / (YRes - 1.0f);
            const float x1 = x;
            const float y1 = y;
            const float z1 = z;

            // [1, 0]
            const float v0 = v - vStep;
            const float y0 = (v0 * 2.0f - 1.0f) * R;
            const float r10 = std::min(std::sqrt(x1 * x1 + y0 * y0), R);
            const float z10 = CorneaZ(r10);

            // [2, 1]
            const float u2 = u + uStep;
            const float x2 = (u2 * 2.0f - 1.0f) * R;
            const float r21 = std::min(std::sqrt(x2 * x2 + y1 * y1), R);
            const float z21 = CorneaZ(r21);

            // [1, 2]
            const float v2 = v + vStep;
            const float y2 = (v2 * 2.0f - 1.0f) * R;
            const float r12 = std::min(std::sqrt(x1 * x1 + y2 * y2), R);
            const float z12 = CorneaZ(r12);

            // [0, 1]
            const float u0 = u - uStep;
            const float x0 = (u0 * 2.0f - 1.0f) * R;
            const float r01 = std::min(std::sqrt(x0 * x0 + y1 * y1), R);
            const float z01 = CorneaZ(r01);

            const Float3 p11 = Float3(x1, y1, z1);