basic shadows

1 files changed, 24 insertions, 0 deletions

diff --git a/camera.cpp b/camera.cpp
index 59a604e..a224fb3 100644
--- a/camera.cpp
+++ b/camera.cpp
@@ -9,6 +9,30 @@ void Camera::init(float vfov, const v3f& f, const v3f& p) {
 	asp = 1.0f;
 }
 
+void Camera::init_shadow(
+	const v3f& dir,
+	const v3f& mic,
+	const v3f& mac
+) {
+	v3f up(0.0f, 1.0f, 0.0f);
+	AABB aabb = { mic, mac };
+	init(0.0f, dir, v3f(0.0f));
+	view = m4f::lookat(
+		dir,
+		v3f(0.0f),
+		up
+	);
+	aabb = m4f::transform(view, aabb);
+	proj = m4f::orth(
+		aabb.min.x,
+		aabb.max.x,
+		aabb.max.y,
+		aabb.min.y,
+		aabb.min.z,
+		aabb.max.z
+	);
+}
+
 void Camera::update() {
 	v3f up(0.0f, 1.0f, 0.0f);
 	view = m4f::lookat(position, position + forward, up);