added a working update for camera

include/camera.hpp

@@ -69,7 +69,7 @@ class Camera {
     int j = pixel_index[1];
     colors[j * number_pixels[0] + i] = color;
   }
-  void Update(float deltaT);
+  void Update(double deltaT);
 
 };
 #endif

include/objects/mesh.hpp

@@ -23,7 +23,7 @@ class Mesh : public Object {
   bool Intersect_Triangle(const Ray &ray, int tri, double &dist) const;
   void Read_Obj(const char *file);
   Box Bounding_Box(int part) const override;
-  void Update(float deltaT) override;
+  void Update(double deltaT) override;
 
 };
 

include/objects/object.hpp

@@ -54,7 +54,7 @@ class Object {
   // If part>=0, return the bounding box for the specified part.
   // If part<0, return the bounding box for the whole object.
   virtual Box Bounding_Box(int part) const = 0;
-  virtual void Update(float deltaT) = 0;
+  virtual void Update(double deltaT) = 0;
 
 };
 

include/objects/plane.hpp

@@ -17,7 +17,7 @@ class Plane : public Object {
   virtual Hit Intersection(const Ray &ray, int part) const override;
   virtual vec3 Normal(const vec3 &point, int part) const override;
   virtual Box Bounding_Box(int part) const override;
-  void Update(float deltaT) override;
+  void Update(double deltaT) override;
 
 };
 

include/objects/sphere.hpp

@@ -18,7 +18,7 @@ class Sphere : public Object {
   virtual Hit Intersection(const Ray &ray, int part) const override;
   virtual vec3 Normal(const vec3 &point, int part) const override;
   virtual Box Bounding_Box(int part) const override;
-  void Update(float deltaT) override;
+  void Update(double deltaT) override;
 
 };
 

include/render_world.hpp

@@ -43,6 +43,6 @@ class Render_World {
   vec3 Cast_Ray(const Ray &ray, int recursion_depth);
   Hit Closest_Intersection(const Ray &ray);
 
-  void Update(float deltaT);
+  void Update(double deltaT);
 };
 #endif

src/camera.cpp

@@ -82,6 +82,7 @@ vec3 Camera::World_Position(const ivec2 &pixel_index) {
   return result;
 }
 
-void Camera::Update(float deltaT) {
-
+void Camera::Update(double deltaT) {
+  position += deltaT * velocity;
+  velocity += deltaT * acceleration;
 }

src/objects/mesh.cpp

@@ -149,6 +149,6 @@ Box Mesh::Bounding_Box(int part) const {
   return b;
 }
 
-void Mesh::Update(float deltaT) {
+void Mesh::Update(double deltaT) {
 
 }

src/objects/plane.cpp

@@ -29,6 +29,6 @@ Box Plane::Bounding_Box(int part) const {
   return b;
 }
 
-void Plane::Update(float deltaT) {
+void Plane::Update(double deltaT) {
 
 }

src/objects/sphere.cpp

@@ -32,6 +32,6 @@ Box Sphere::Bounding_Box(int part) const {
   return box;
 }
 
-void Sphere::Update(float deltaT) {
+void Sphere::Update(double deltaT) {
 
 }

src/render_world.cpp

@@ -95,10 +95,13 @@ void Render_World::Clear_Hierarchy() {
   hierarchy.tree.clear();
 }
 
-void Render_World::Update(float deltaT) {
+void Render_World::Update(double deltaT) {
+  if (abs(deltaT) < std::numeric_limits<double>::epsilon()) {
+    return;
+  }
+  camera.Update(deltaT);
   for (Object *object: objects) {
     object->Update(deltaT);
   }
-  camera.Update(deltaT);
   hierarchy.Update();
 }

tools/demos/image/main.cpp

@@ -72,7 +72,7 @@ int main(int argc, char **argv) {
 
   // Parse commandline options
   while (1) {
-    int opt = getopt(argc, argv, "s:i:m:o:x:y:h");
+    int opt = getopt(argc, argv, "s:i:o:x:y:h");
     if (opt == -1) break;
     switch (opt) {
       case 's':