Initial release

src/main/java/de/nicolasklier/custom_structures/Helper.java

@@ -0,0 +1,84 @@
+package de.nicolasklier.custom_structures;
+
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.LivingEntity;
+import net.minecraft.entity.decoration.ItemFrameEntity;
+import net.minecraft.entity.projectile.ProjectileUtil;
+import net.minecraft.util.hit.EntityHitResult;
+import net.minecraft.util.hit.HitResult;
+import net.minecraft.util.math.Box;
+import net.minecraft.util.math.Vec3d;
+import net.minecraft.world.RaycastContext;
+
+public class Helper {
+	public static HitResult raycastInDirection(MinecraftClient client, float tickDelta, Vec3d direction) {
+	    Entity entity = client.getCameraEntity();
+	    if (entity == null || client.world == null) {
+	        return null;
+	    }
+	 
+	    double reachDistance = 100f;	// Custom reach size of 100 blocks.
+	    HitResult target = raycast(entity, reachDistance, tickDelta, false, direction);
+	    double extendedReach = reachDistance;
+	 
+	    Vec3d cameraPos = entity.getCameraPosVec(tickDelta);
+	 
+	    extendedReach = extendedReach * extendedReach;
+	    if (target != null) {
+	        extendedReach = target.getPos().squaredDistanceTo(cameraPos);
+	    }
+	 
+	    Vec3d vec3d3 = cameraPos.add(direction.multiply(reachDistance));
+	    Box box = entity
+	            .getBoundingBox()
+	            .stretch(entity.getRotationVec(1.0F).multiply(reachDistance))
+	            .expand(1.0D, 1.0D, 1.0D);
+	    
+	    EntityHitResult entityHitResult = ProjectileUtil.raycast(
+	            entity,
+	            cameraPos,
+	            vec3d3,
+	            box,
+	            (entityx) -> !entityx.isSpectator(),
+	            extendedReach
+	    );
+	 
+	    if (entityHitResult == null) {
+	        return target;
+	    }
+	 
+	    Entity entity2 = entityHitResult.getEntity();
+	    Vec3d vec3d4 = entityHitResult.getPos();
+	    double g = cameraPos.squaredDistanceTo(vec3d4);
+	    
+	    if (g > reachDistance) {
+	        return null;
+	    } else if (g < extendedReach || target == null) {
+	        target = entityHitResult;
+	        if (entity2 instanceof LivingEntity || entity2 instanceof ItemFrameEntity) {
+	            client.targetedEntity = entity2;
+	        }
+	    }
+	 
+	    return target;
+	}
+	 
+	private static HitResult raycast(
+	        Entity entity,
+	        double maxDistance,
+	        float tickDelta,
+	        boolean includeFluids,
+	        Vec3d direction
+	) {
+	    Vec3d end = entity.getCameraPosVec(tickDelta).add(direction.multiply(maxDistance));
+	    return entity.world.raycast(new RaycastContext(
+	            entity.getCameraPosVec(tickDelta),
+	            end,
+	            RaycastContext.ShapeType.OUTLINE,
+	            includeFluids ? RaycastContext.FluidHandling.ANY : RaycastContext.FluidHandling.NONE,
+	            entity
+	    ));
+	}
+
+}