Method WriteCamera

code/Pbrt/PbrtExporter.cpp:308–377

}

void PbrtExporter::WriteCamera(int i) {
    auto camera = mScene->mCameras[i];
    bool cameraActive = i == 0;

    mOutput << "# - Camera " << i+1 <<  ": "
        << camera->mName.C_Str() << "\n";

    // Get camera aspect ratio
    float aspect = camera->mAspect;
    if (aspect == 0) {
        aspect = 4.f/3.f;
        mOutput << "#   - Aspect ratio : 1.33333 (no aspect found, defaulting to 4/3)\n";
    } else {
        mOutput << "#   - Aspect ratio : " << aspect << "\n";
    }

    // Get Film xres and yres
    int xres = 1920;
    int yres = (int)round(xres/aspect);

    // Print Film for this camera
    if (!cameraActive)
        mOutput << "# ";
    mOutput << "Film \"rgb\" \"string filename\" \"" << mFile << ".exr\"\n";
    if (!cameraActive)
        mOutput << "# ";
    mOutput << "    \"integer xresolution\" [" << xres << "]\n";
    if (!cameraActive)
        mOutput << "# ";
    mOutput << "    \"integer yresolution\" [" << yres << "]\n";

    // Get camera fov
    float hfov = AI_RAD_TO_DEG(camera->mHorizontalFOV);
    float fov = (aspect >= 1.0) ? hfov : (hfov / aspect);
    if (fov < 5) {
        std::cerr << fov << ": suspiciously low field of view specified by camera. Setting to 45 degrees.\n";
        fov = 45;
    }

    // Get camera transform
    aiMatrix4x4 worldFromCamera = GetNodeTransform(camera->mName);

    // Print Camera LookAt
    auto position = worldFromCamera * camera->mPosition;
    auto lookAt = worldFromCamera * (camera->mPosition + camera->mLookAt);
    aiMatrix3x3 worldFromCamera3(worldFromCamera);
    auto up = worldFromCamera3 * camera->mUp;
    up.Normalize();

    if (!cameraActive)
        mOutput << "# ";
    mOutput << "Scale 1 1 1\n";
    if (!cameraActive)
        mOutput << "# ";
    mOutput << "LookAt "
        << position.x << " " << position.y << " " << position.z << "\n";
    if (!cameraActive)
        mOutput << "# ";