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-rw-r--r--dev/a6-harold/sky.cc5
1 files changed, 5 insertions, 0 deletions
diff --git a/dev/a6-harold/sky.cc b/dev/a6-harold/sky.cc
index 0819ebe..bc08ca0 100644
--- a/dev/a6-harold/sky.cc
+++ b/dev/a6-harold/sky.cc
@@ -28,6 +28,11 @@ void Sky::Init(ShaderProgram *stroke3d_shaderprog) {
bool Sky::ScreenPtHitsSky(const Matrix4 &view_matrix, const Matrix4 &proj_matrix,
const Point2 &normalized_screen_pt, Point3 *sky_point)
{
+ // You will need the eye point, this can be
+ // determined from the view matrix as follows:
+ Matrix4 camera_matrix = view_matrix.Inverse();
+ Point3 eye = camera_matrix.ColumnToPoint3(3);
+
// TODO: Stitch together your worksheet implementation of this method
return true;
}