szene mit vier roten kugeln aufgebaut. der renderer unterstuetzt jetzt bis zu 100 objekte

Collision.c

@@ -4,9 +4,9 @@
 vec3 collisionPointSphere(ray *lightray, sphere *object)
 {
     vec3 collisionPoint;
-    collisionPoint.x = -1;
-    collisionPoint.y = -1;
-    collisionPoint.z = -1;
+    collisionPoint.x = -10000000;
+    collisionPoint.y = -10000000;
+    collisionPoint.z = -10000000;
     double a = lightray->direction.x * lightray->direction.x + lightray->direction.y * lightray->direction.y + lightray->direction.z * lightray->direction.z;
     double b = 2 * ((lightray->direction.x * (lightray->origin.x - object->origin.x)) + (lightray->direction.y * (lightray->origin.y - object->origin.y)) + (lightray->direction.z * (lightray->origin.z - object->origin.z)));
     double c = (lightray->origin.x * lightray->origin.x + object->origin.x * object->origin.x - 2 * lightray->origin.x * object->origin.x)

examples.c

@@ -36,8 +36,16 @@ void exampleSphere( int width, int height, int channels, unsigned char *image) {
     cam1.width = 1.920;
     cam1.height = 1.080;
     vec3 sphereOrigin = (vec3){0,0,5};
-    double sphereRadius = 2.0;
-    sphere obj = (sphere){sphereOrigin, sphereRadius};
+    double sphereRadius = 1.0;
+    sphere obj1 = (sphere){sphereOrigin, sphereRadius};
+    sphere **objectList = (sphere **) calloc(4+1, sizeof(sphere*));;
+    objectList[0] = &obj1;
+    sphere obj2 = (sphere){vec3Add(sphereOrigin, (vec3){3,0,0}), sphereRadius};
+    objectList[1] = &obj2;
+    sphere obj3 = (sphere){vec3Add(sphereOrigin, (vec3){-3,0,0}), sphereRadius};
+    objectList[2] = &obj3;
+    sphere obj4 = (sphere){vec3Add(sphereOrigin, (vec3){1,1,3}), sphereRadius};
+    objectList[3] = &obj4;
 
     vec3 worldUp = (vec3){0, 1, 0};
     vec3 screenX = vec3Cross(worldUp, cam1.direction);
@@ -45,7 +53,7 @@ void exampleSphere( int width, int height, int channels, unsigned char *image) {
     vec3 screenMiddlePoint = vec3Add(cam1.origin, vec3Scale(cam1.direction, cam1.screenDistance));
     vec3 screenTopLeft = vec3Add(
         vec3Add(screenMiddlePoint,
-            vec3Scale(screenY, -cam1.height/2.0)),
+            vec3Scale(screenY, -cam1.height/2.0)),///////////////////////////////////////////////////////////////////////////////////////////////////////////////aendern minus weg
         vec3Scale(screenX, -cam1.width/2.0)
         );
     double pixelStepX = cam1.width / cam1.resolutionX;
@@ -71,7 +79,7 @@ void exampleSphere( int width, int height, int channels, unsigned char *image) {
 
         lightRay->direction = vec3Normalize(vec3Subtract(*pixelOrigin, cam1.origin));
 
-        pixelColor = raytraceSphere(&obj, lightRay);
+        pixelColor = raytraceSphere(objectList, lightRay);
         free(pixelOrigin);
         free(lightRay);
 
@@ -82,4 +90,5 @@ void exampleSphere( int width, int height, int channels, unsigned char *image) {
             image[step+3] = 255;
         }
     }
+    free(objectList);
 }

raytrace.c

@@ -1,18 +1,36 @@
+#include <stdlib.h>
 #include "structs.h"
 #include "collision.h"
 #include "vectorOp.h"
+#define MAXSPHERES 100
 
-RGBA raytraceSphere(sphere *obj, ray *lightray) {
-    RGBA pixel;
-    pixel.r = 0;
-    pixel.g = 0;
-    pixel.b = 0;
-    pixel.a = 1;
+RGBA raytraceSphere(sphere **objectList, ray *lightray) {
+    RGBA pixel = (RGBA){0,0,0,1};
+    const int lightBounces = 1;
+    sphere **spheresHitList = (sphere **)calloc( (lightBounces + 1),sizeof(sphere*) );
 
-    vec3 collisionPoint = collisionPointSphere(lightray, obj);
-    if (collisionPoint.x == -1) {return pixel;}
-    vec3 sphereNormal = vec3Normalize(vec3Subtract(collisionPoint, obj->origin));
-    pixel.r = -vec3Product(sphereNormal, lightray->direction);
+    sphere *nearestSphere = nullptr;
+    vec3 nearestCollisionPoint = {10000,10000,10000};
+    for (int i = 0; i < 100 && objectList[i] != nullptr; i++) {
+        vec3 collisionPoint = collisionPointSphere(lightray, objectList[i]);
+        if (collisionPoint.x == -10000000) {
+
+        }
+        else{
+            if (vec3Length(collisionPoint)< vec3Length(nearestCollisionPoint)) {
+                nearestCollisionPoint = collisionPoint;
+                nearestSphere = objectList[i];
+            }
+
+        }
+    }
+    if (nearestSphere != nullptr) {
+        vec3 sphereNormal = vec3Normalize(vec3Subtract(nearestCollisionPoint, nearestSphere->origin));
+        pixel.r = -vec3Product(sphereNormal, lightray->direction);
+    }
+
+
+    free(spheresHitList);
     return pixel;
 
 }

raytrace.h

@@ -1,4 +1,4 @@
 #pragma once
 #include "structs.h"
 
-RGBA raytraceSphere(sphere *, ray *);
+RGBA raytraceSphere(sphere **, ray *);