fixed some stuff

main.c

@@ -20,7 +20,7 @@ Color circle_color(Point hit, Point direction, SceneObject *self) {
     Color color = self->color;
 
     if (angle > 90) angle = 180 - angle ; // clamp angle to 0-90
-    color = color_mix(color, color_new(0,0,0), 1 - (angle / (double) 90));
+    color = color_mix(color, color_new(0,0,0), 1 - (angle / (double) 120));
 
     return color;
 }
@@ -32,15 +32,18 @@ SceneObject circle_new(Point loc, double radius) {
     so.args[0] = radius;
     so.distance = circle_dist;
     so.get_color = circle_color;
-    so.color = color_new(255,0,0);
+    so.color = color_new(255,255,255);
     return so;
 }
 
+
+
+
 int main(int argc, char* argv[]) {
     int threads = 1;
     Camera cam;
     cam.fov = 90;
-    camera_set_looking_at(&cam, pt_new(-.6,0,0), pt_new(-.5,1,0));
+    camera_set_looking_at(&cam, pt_new(0,0,0), pt_new(1,1,1));
 
     if (argc > 1) {
         threads = atoi(argv[1]);
@@ -49,11 +52,11 @@ int main(int argc, char* argv[]) {
     printf("threads: %d\n", threads);
 
     // create basic scene with up to 10 objects
-    Scene scene = scene_new(800, 600, 10);
-    scene.max_steps = 64;
+    Scene scene = scene_new(1920, 1080, 10);
+    scene.max_steps = 256;
     scene.threshold = 0.02;
 
-    scene_add_obj(&scene, circle_new(pt_new(0,1,0), .2));
+    scene_add_obj(&scene, circle_new(pt_new(1,1,1), .2));
 
     //scene_add_obj(&scene, circle_new(pt_new(0,2,0), 0.5));
     //scene_add_obj(&scene, circle_new(pt_new(0,-2,0), 0.5));

marcher.h

@@ -8,6 +8,12 @@
 #define M_PI 3.14159265358979323846
 #endif
 
+struct __myvec;
+struct __mymtrx;
+struct __mycam;
+struct __myobject;
+struct __myscene;
+
 typedef struct __myvec {
     double x;
     double y;
@@ -19,10 +25,10 @@ typedef struct __mymtrx {
 } Matrix;
 
 inline Point pt_new(double x, double y, double z);
-Point pt_scale(Point pt, double length);
+inline Point pt_scale(Point pt, double length);
 inline Point pt_normalize(Point pt);
 inline double pt_length(Point pt);
-void pt_add(Point* pt, Point add);
+inline void pt_add(Point* pt, Point add);
 inline void pt_sub(Point* pt, Point sub);
 inline double pt_dist(Point p1, Point p2);
 inline Point pt_mod(Point pt, double mod);
@@ -53,6 +59,7 @@ typedef struct __myobject {
     double (*distance)(Point, struct __myobject *); 
     Color (*get_color)(Point, Point, struct __myobject *);
     Color color;
+    struct __myscene* scene;
 } SceneObject;
 
 typedef struct __myscene {

src/point.c

@@ -11,7 +11,7 @@ inline Point pt_new(double x, double y, double z) {
 }
 
 // scale vector to length
-Point pt_scale(Point pt, double length) {
+inline Point pt_scale(Point pt, double length) {
     double f = length / pt_length(pt);
     return pt_new(
         pt.x * f,
@@ -42,7 +42,7 @@ inline double pt_length(Point pt) {
 }
 
 // add the vector add to the vector pt
-void pt_add(Point* pt, Point add) {
+inline void pt_add(Point* pt, Point add) {
     pt->x = pt->x + add.x;
     pt->y = pt->y + add.y;
     pt->z = pt->z + add.z;
@@ -103,9 +103,9 @@ void pt_orthogonal_plane(Point pt, Point *span_z, Point *span_xy) {
 
 inline Point pt_mod(Point pt, double mod) {
     return pt_new(
-        fmod(pt.x, mod),
-        fmod(pt.y, mod),
-        fmod(pt.z, mod)
+        fabs(fmod(pt.x, mod)),
+        fabs(fmod(pt.y, mod)),
+        fabs(fmod(pt.z, mod))
     );
 }
 

src/scene.c

@@ -28,7 +28,10 @@ void scene_add_obj(Scene* scene, SceneObject object) {
     if (scene->object_count >= scene->allocated_space) return; // limit reached
     // TODO realloc
 
+    
     scene->objects[scene->object_count] = object;
+    // link containing scene
+    scene->objects[scene->object_count].scene = scene;
 
     scene->object_count++;
 }
@@ -102,7 +105,11 @@ Color march_ray(Point origin, Point direction, Scene* scene) {
     // check for a hit
     if (dist <= threshold) {
         // a hit!
-        return closest_obj->get_color(pos, direction, closest_obj);
+        double f = (steps / (double) scene->max_steps);
+        f = f * f * f * f;
+
+        Color c = closest_obj->get_color(pos, direction, closest_obj);
+        return color_mix(c, color_new(0,0,0), f);
 
     } else {
         // a miss :(