Graphics assignment 6 part 1 is almost finished.

481a8b48 · Sander Mathijs van Veen · 1596b66a · 481a8b48 · 481a8b48 · 481a8b48
Commit 481a8b48 authored Oct 19, 2010 by Sander Mathijs van Veen
10 changed files
--- a/graphics/ass6/main.c
+++ b/graphics/ass6/main.c
 /* Computer Graphics, Assignment, Ray-tracing 1
 *
- * Student name ....
- * Student email ...
- * Collegekaart ....
+ * Student name .... Sander van Veen, Taddeüs Kroes
+ * Student email ... sander@vo20.nl, taddeuskroes@gmail.com
+ * Collegekaart .... 6167969,
 * Date ............ 
 * Comments ........ 
- *
- *
- * (always fill in these fields before submitting!!)
 */

 #include <sys/time.h>
@@ -167,7 +164,8 @@ ray_trace(void)
    // Compute camera coordinate system from camera position
    // and look-at point
    up_vector = v3_create(0, 0, 1);
-    forward_vector = v3_normalize(v3_subtract(scene_camera_lookat, scene_camera_position));
+    forward_vector = v3_normalize(v3_subtract(scene_camera_lookat, 
+	                                          scene_camera_position));
    right_vector = v3_normalize(v3_crossprod(forward_vector, up_vector));
    up_vector = v3_crossprod(right_vector, forward_vector);

@@ -175,26 +173,69 @@ ray_trace(void)
    // and image aspect ratio. This is the size of the plane at distance
    // of one unit from the camera position.
    image_plane_height = 2.0 * tan(0.5*VFOV/180*M_PI);
-    image_plane_width = image_plane_height * (1.0 * framebuffer_width / framebuffer_height);
+    image_plane_width = image_plane_height * (1.0 * framebuffer_width 
+	                                          / framebuffer_height);
+
+	float l = image_plane_width * .5f, // measured from e along right_vector
+	      r = -l,
+	      b = image_plane_height * .5f, // measured from e along up_vector
+	      t = -b;
+
+	float u, v;

-    // ...
-    // ...
-    // ...
+	float frame_height_div = 1.0 / framebuffer_height,
+	      frame_width_div = 1.0 / framebuffer_width;
+
+	up_vector = v3_normalize(up_vector);
+
+	vec3 ray_o = scene_camera_position,
+	     ray_d = forward_vector;
+	//     e = scene_camera_position;
+	//	 e = v3_subtract(scene_camera_lookat, scene_camera_position);
 	
    // Loop over all pixels in the framebuffer
-    for (j = 0; j < framebuffer_height; j++)
+    for( j = 0; j < framebuffer_height; j++ )
    {
-        for (i = 0; i < framebuffer_width; i++)
+        for( i = 0; i < framebuffer_width; i++ )
        {
-            // ...
-            // ...
-            // ...
+			// compute viewing ray
+			//u = l + (r - l) * (i + 0.5) * frame_width_div;
+			//v = b + (t - b) * (j + 0.5) * frame_height_div;
+			
+			// One unit distance, adjust to plane center and normalize
+			ray_d = v3_normalize(v3_create(
+				((i + .5f) * frame_width_div) + r,
+			    ((framebuffer_height - j + .5f) * frame_height_div) + t,
+			    1.f
+			));
+			
+			ray_d = v3_create(
+				right_vector.x * ray_d.x + up_vector.x * ray_d.y
+				+ forward_vector.x * ray_d.z,
+				right_vector.y * ray_d.x + up_vector.y * ray_d.y
+				+ forward_vector.y * ray_d.z,
+				right_vector.z * ray_d.x + up_vector.z * ray_d.y
+				+ forward_vector.z * ray_d.z
+			);
+
+			//ray_d = v3_normalize(v3_add(
+			//	ray_o,
+			//	v3_add(v3_multiply(right_vector, u), v3_multiply(up_vector, v))
+			//));
+
+			//if( i == 0 && j < 20 )
+			//	printf("d: [%f, %f, %f]\n", ray_d.x, ray_d.y, ray_d.z);
+
+			//ray_origin = v3_add(e, v3_add(v3_multiply(right_vector, u),
+			//                              v3_multiply(up_vector, v)));
+
+			color = ray_color(0, ray_o, ray_d); 

            // Output pixel color
            put_pixel(i, j, color.x, color.y, color.z);
        }
-
-        sprintf(buf, "Ray-tracing ::: %.0f%% done", 100.0*j/framebuffer_height);
+        sprintf(buf, "Ray-tracing ::: %.0f%% done",
+		        100.0 * j / framebuffer_height);
        glutSetWindowTitle(buf);
    }

@@ -522,7 +563,6 @@ motion_func(int x, int y)
    }
 }

-
 int
 main(int argc, char **argv)
 {

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