refactor. ich habe den teil aus dem exampleSphere rausgezogen der generell gebraucht wird. displaySzene() nimmt eine szene an und lässt den raytracer fr jeden Pixel laufen

2026-07-29 21:13:54 +02:00
parent fb44398c24
commit 1742d7d0f5
8 changed files with 90 additions and 63 deletions
@@ -0,0 +1,56 @@
+//
+// Created by ary on 29.07.2026.
+//
+
+#include "interface.h"
+#include "examples.h"
+#include "structs.h"
+#include "vectorOp.h"
+#include "raytrace.h"
+#include <stdlib.h>
+
+void displaySzene(sphere **objectList, int objectCount, camera cam1, int width, int height, int channels, unsigned char **image) {
+    const vec3 worldUp = (vec3){0, 1, 0};
+    vec3 screenX = vec3Cross(worldUp, cam1.direction);
+    vec3 screenY = vec3Cross(screenX, cam1.direction);
+    vec3 screenMiddlePoint = vec3Add(cam1.origin, vec3Scale(cam1.direction, cam1.screenDistance));
+    vec3 screenTopLeft = vec3Add(
+        vec3Add(screenMiddlePoint,
+            vec3Scale(screenY, -cam1.height/2.0)),///////////////////////////////////////////////////////////////////////////////////////////////////////////////aendern minus weg
+        vec3Scale(screenX, -cam1.width/2.0)
+        );
+    double pixelStepX = cam1.width / cam1.resolutionX;
+    double pixelStepY = cam1.height / cam1.resolutionY;
+    vec3 vecPixelStepX = vec3Scale(screenX, pixelStepX);
+    vec3 vecPixelStepY = vec3Scale(screenY, pixelStepY);
+    for (int i = 0; i < height * width; i++) {
+        int step = i *channels;
+        int x = i % width;
+        int y = i / width;
+        RGBA pixelColor;
+
+        vec3 *pixelOrigin = (vec3 *)malloc(sizeof(vec3));
+        *pixelOrigin = vec3Add(screenTopLeft,
+            vec3Add(
+                vec3Scale(vecPixelStepX, x),
+                vec3Scale(vecPixelStepY, y)
+                )
+        );
+
+        ray *lightRay = (ray *)malloc(sizeof(ray));;
+        lightRay->origin = cam1.origin;
+
+        lightRay->direction = vec3Normalize(vec3Subtract(*pixelOrigin, cam1.origin));
+
+        pixelColor = raytraceSphere(objectList, lightRay);
+        free(pixelOrigin);
+        free(lightRay);
+
+        (*image)[step] = (int)(pixelColor.r * 255.0);
+        (*image)[step+1] = (int)(pixelColor.g * 255.0);
+        (*image)[step+2] = (int)(pixelColor.b * 255.0);
+        if (channels == 4) {
+            (*image)[step+3] = 255;
+        }
+    }
+}