Method collisionRayTrace

src/main/java/net/minecraft/block/Block.java:705–819

Ray traces through the blocks collision from start vector to end vector returning a ray trace hit. @param start The start vector @param end The end vector

(World worldIn, BlockPos pos, Vec3 start, Vec3 end)

     * @param end The end vector
     */
    public MovingObjectPosition collisionRayTrace(World worldIn, BlockPos pos, Vec3 start, Vec3 end)
    {
        this.setBlockBoundsBasedOnState(worldIn, pos);
        start = start.addVector(-pos.getX(), -pos.getY(), -pos.getZ());
        end = end.addVector(-pos.getX(), -pos.getY(), -pos.getZ());
        Vec3 vec3 = start.getIntermediateWithXValue(end, this.minX);
        Vec3 vec31 = start.getIntermediateWithXValue(end, this.maxX);
        Vec3 vec32 = start.getIntermediateWithYValue(end, this.minY);
        Vec3 vec33 = start.getIntermediateWithYValue(end, this.maxY);
        Vec3 vec34 = start.getIntermediateWithZValue(end, this.minZ);
        Vec3 vec35 = start.getIntermediateWithZValue(end, this.maxZ);

        if (!this.isVecInsideYZBounds(vec3))
        {
            vec3 = null;
        }

        if (!this.isVecInsideYZBounds(vec31))
        {
            vec31 = null;
        }

        if (!this.isVecInsideXZBounds(vec32))
        {
            vec32 = null;
        }

        if (!this.isVecInsideXZBounds(vec33))
        {
            vec33 = null;
        }

        if (!this.isVecInsideXYBounds(vec34))
        {
            vec34 = null;
        }

        if (!this.isVecInsideXYBounds(vec35))
        {
            vec35 = null;
        }

        Vec3 vec36 = null;

        if (vec3 != null && (vec36 == null || start.squareDistanceTo(vec3) < start.squareDistanceTo(vec36)))
        {
            vec36 = vec3;
        }

        if (vec31 != null && (vec36 == null || start.squareDistanceTo(vec31) < start.squareDistanceTo(vec36)))
        {
            vec36 = vec31;
        }

        if (vec32 != null && (vec36 == null || start.squareDistanceTo(vec32) < start.squareDistanceTo(vec36)))
        {
            vec36 = vec32;
        }