Is MoltenVK free and open source?

Yes it has become free and open source.
Repository - https://github.com/KhronosGroup/MoltenVK
And some news here - https://www.anandtech.com/show/12465/khronos-group-extends-vulkan-portability-with-opensource

I was confused when come across this page https://moltengl.com/free-trial/ while I was sure that MoltenVK is open source. :) But finally understood that this is just an outdated post.

Allow symbol links in Apache 2.4 Debian

Yesterday I attempted to add a symbol link into the server dirrectory and had 403 error. Today I solved this problem. And I am writing for remember. I use ubuntu, so the main configuration file path is /etc/apache2/apache2.conf. I assume you don't changes default configuration.

1. Do

chmod -o+x 

for every dir in a path to folder. For example:

sudo chmod o+x /home /home/user/ /home/user/work/ /home/user/work/game

2. Add FollowSymLinks in your dirrectory scope options.

<Directory /var/www/>
        Options Indexes FollowSymLinks
        AllowOverride None
        Require all granted
</Directory> 

 That is all.

PS: For mor protection you can write Options=FollowSymLinks into AllowOverride. After that you can add .htaccess with this option.

CentOS installing and configuring

I'm installing CentOS minimal. I downloaded last version from the official site and installed it in VirtualBox. Earlier I worked only with Ubuntu and Gentoo and this is new for me. Here I want to tell about network configuration, user creation, and server installing.

1. Network

There are many solutions. But the more habitual for me are two:

1. Connecting a virtual machine as an virtual adapter with a proxy.
2. Saving the default configuration with NAT and configuring a port forwarding. It is simple but not flexibly.

I'll describe second solution. You can find first solution in the article "Raspberry Pi without monotor". For port forwarding press the button in the network configuration window and configure it as on the screen below. (Note: you must run Virtual Box with root rights)

Port forwarding window

Now, you can test networking. Enter following commands:

ifconfig eth0 up
dhclient eth0

Second command will get a network configuration from the DHCP server. For the automatic configuration after booting, you must edit this file:

/etc/sysconfig/network-scripts/ifcfg-eth0

For DHCP server:

ONBOOT=yes
BOOTPROTO=dhcp 

If you want to set a static ip adress:

DEVICE=eth0
BOOTPROTO=static
NM_CONTROLLED=yes
ONBOOT=yes
TYPE=Ethernet
IPADDR=<address>
NETMASK=<mask>
NETWORK=<сеть (ip address with a mask)>
BROADCAST=<broadcast>
GATEWAY=<gateway>

2. Cent OS upgrading. 

Just enter the following command:

yum update

You can use -y flag for answering "yes" to all questions.

3. Apache installing

For apache installing do following:

yum install httpd

For adding into autorun, you can use chkconfig.

chkconfig httpd on

For starting service, enter:

service httpd start

All apache configurations in /ect/httpd/conf/httpd.conf.

4. PHP installing 

Installing:

yum install php

Apache restarting:

 service httpd restart

All configurations in /etc/php.ini.

5. User adding

I will adding user with name ssh_user.

useradd ssh_user
passwd ssh_user

passwd will offer you enter new password for user. After that, you can try to login:

su ssh_user

Now, you must to configure sudo. This can be done with visudo util.
Warning!: If you had never used vim editor earlier, do that:

yum install nano
export EDITOR=nano

This operations will install simple editor "nano" and set it as default editor. Now, when you will call visudo, it in order will calling nano. If you will mistakes in configuration, visudo will asking you, what to do next. Answer "e", and editing will continue.
Now, visudo will open sudoers file. Add following string into User Aliases section:

ssh_user ALL = root ALL

Save this file. New user will posible to run applications on behalf of root.

Isometric in Blender

I used Blender for creating isometric sprites. But, this process needs  automatization.
So, I created a camera with an isometric view and set it at angle of 60 degrees.  Then, I set rotation point to the center. After that, I selected the camera and pressed Ctrl+D and R (rotate 45 degrees). Repeated this for each of 8 views. Now, render. You can select current camera with Ctrl+<camera number> and render with F12.