the function

protected boolean func_145771_j(double p_145771_1_, double p_145771_3_, double p_145771_5_)
    {
        int i = MathHelper.floor_double(p_145771_1_);
        int j = MathHelper.floor_double(p_145771_3_);
        int k = MathHelper.floor_double(p_145771_5_);
        double d3 = p_145771_1_ - (double)i;
        double d4 = p_145771_3_ - (double)j;
        double d5 = p_145771_5_ - (double)k;
        List list = this.worldObj.func_147461_a(this.boundingBox);

        if (list.isEmpty() && !this.worldObj.func_147469_q(i, j, k))
        {
            return false;
        }
        else
        {
            boolean flag = !this.worldObj.func_147469_q(i - 1, j, k);
            boolean flag1 = !this.worldObj.func_147469_q(i + 1, j, k);
            boolean flag2 = !this.worldObj.func_147469_q(i, j - 1, k);
            boolean flag3 = !this.worldObj.func_147469_q(i, j + 1, k);
            boolean flag4 = !this.worldObj.func_147469_q(i, j, k - 1);
            boolean flag5 = !this.worldObj.func_147469_q(i, j, k + 1);
            byte b0 = 3;
            double d6 = 9999.0D;

            if (flag && d3 < d6)
            {
                d6 = d3;
                b0 = 0;
            }

            if (flag1 && 1.0D - d3 < d6)
            {
                d6 = 1.0D - d3;
                b0 = 1;
            }

            if (flag3 && 1.0D - d4 < d6)
            {
                d6 = 1.0D - d4;
                b0 = 3;
            }

            if (flag4 && d5 < d6)
            {
                d6 = d5;
                b0 = 4;
            }

            if (flag5 && 1.0D - d5 < d6)
            {
                d6 = 1.0D - d5;
                b0 = 5;
            }

            float f = this.rand.nextFloat() * 0.2F + 0.1F;

            if (b0 == 0)
            {
                this.motionX = (double)(-f);
            }

            if (b0 == 1)
            {
                this.motionX = (double)f;
            }

            if (b0 == 2)
            {
                this.motionY = (double)(-f);
            }

            if (b0 == 3)
            {
                this.motionY = (double)f;
            }

            if (b0 == 4)
            {
                this.motionZ = (double)(-f);
            }

            if (b0 == 5)
            {
                this.motionZ = (double)f;
            }

            return true;
        }
    }