pinhole camera ray map like vanilla (vertical fov 70, horizontal from aspect, pixel centres, no roll) instead of yaw/pitch corner rotation that squashed photos vertically by cos 35, shared buildRayMap in test tools, camera projection test scenes

tools/EntityTestRender.java

@@ -4,7 +4,6 @@ import eu.mhsl.minecraft.pixelpics.render.render.*;
 import eu.mhsl.minecraft.pixelpics.render.sky.SkyContext;
 import eu.mhsl.minecraft.pixelpics.render.snapshot.WorldSnapshot;
 import eu.mhsl.minecraft.pixelpics.render.tint.BiomeTintProvider;
-import eu.mhsl.minecraft.pixelpics.render.util.MathUtil;
 import org.bukkit.Location;
 import org.bukkit.Material;
 import org.bukkit.block.data.BlockData;
@@ -23,8 +22,7 @@ import java.util.logging.Logger;
 public class EntityTestRender {
 
     static final String ROOT = "/home/elias/Dokumente/mcTestServer/plugins/PixelPics";
-    static final double H_FOV_HALF = Math.toRadians(35);
-    static final Vector BASE = new Vector(1, 0, 0);
+    static final double V_FOV_HALF = Math.toRadians(eu.mhsl.minecraft.pixelpics.render.render.DefaultScreenRenderer.V_FOV_DEG / 2);
     static final int SSAA = 3;
     static final int TW = 200, TH = 230; // per-view tile size
 
@@ -232,7 +230,7 @@ public class EntityTestRender {
         double ext = 0;
         for (int a = 0; a < 3; a++) ext = Math.max(ext, re.aabbMax[a] - re.aabbMin[a]);
         if (ext < 0.5) ext = 0.5;
-        double dist = ext / (2 * Math.tan(H_FOV_HALF)) * 1.25 + 0.4;
+        double dist = ext / (2 * Math.tan(V_FOV_HALF)) * 1.25 + 0.4;
 
         Vector center = new Vector(cx, cy, cz);
         Vector cam = new Vector(cx - dist, cy + dist * 0.42, cz - dist * 0.15);
@@ -293,28 +291,7 @@ public class EntityTestRender {
         return cell;
     }
 
-    // Replicated from DefaultScreenRenderer.buildRayMap.
     static List<Vector> buildRayMap(Location eye, int width, int height) {
-        Vector dir = eye.getDirection();
-        double angleYaw = Math.atan2(dir.getZ(), dir.getX());
-        double anglePitch = Math.atan2(dir.getY(), Math.sqrt(dir.getX() * dir.getX() + dir.getZ() * dir.getZ()));
-        double yawHalf = H_FOV_HALF;
-        double pitchHalf = Math.atan(Math.tan(yawHalf) * ((double) height / width));
-        Vector ll = MathUtil.doubleYawPitchRotation(BASE, -yawHalf, -pitchHalf, angleYaw, anglePitch);
-        Vector ul = MathUtil.doubleYawPitchRotation(BASE, -yawHalf, pitchHalf, angleYaw, anglePitch);
-        Vector lr = MathUtil.doubleYawPitchRotation(BASE, yawHalf, -pitchHalf, angleYaw, anglePitch);
-        Vector ur = MathUtil.doubleYawPitchRotation(BASE, yawHalf, pitchHalf, angleYaw, anglePitch);
-        List<Vector> rayMap = new ArrayList<>(width * height);
-        Vector leftFrac = ul.clone().subtract(ll).multiply(1.0 / (height - 1));
-        Vector rightFrac = ur.clone().subtract(lr).multiply(1.0 / (height - 1));
-        for (int pitch = 0; pitch < height; pitch++) {
-            Vector leftPitch = ul.clone().subtract(leftFrac.clone().multiply(pitch));
-            Vector rightPitch = ur.clone().subtract(rightFrac.clone().multiply(pitch));
-            Vector yawFrac = rightPitch.clone().subtract(leftPitch).multiply(1.0 / (width - 1));
-            for (int yaw = 0; yaw < width; yaw++) {
-                rayMap.add(leftPitch.clone().add(yawFrac.clone().multiply(yaw)).normalize());
-            }
-        }
-        return rayMap;
+        return eu.mhsl.minecraft.pixelpics.render.render.DefaultScreenRenderer.buildRayMap(eye, width, height);
     }
 }