What can it do?
Lots of things! See the features page for an up-to-date list of the current features. Also, take a look at the screenshots page to see for yourself the kinds of eye candy OGRE can pump out.
Is OGRE A Game Engine?
No. OGRE can be (and indeed has been) used to make games, but OGRE is deliberately designed to provide just a world-class graphics solution; for other features like sound, networking, AI, collision, physics etc, you will need to integrate it with other libraries, something several frameworks have done, and we have a collision / physics reference integration library as an example in our distribution.
Why? Well, one reason is that not everyone who needs a 3D engine wants to make games, so we don't assume that you do - you can use OGRE for games, simulations, business applications, anything at all. Secondly, even within the games industry, requirements can vary widely; for
example a MMORPG will need a very different kind of network library than an FPS, and a flight sim will need a different kind of collision / physics system to fighting game. If OGRE included all these features, we would be enforcing a particular set of libraries on you, with an
inbuilt set of assumed requirements, and that's not good design. Instead, we provide a very integration friendly API and let YOU choose the other libraries, if you want them. Many experiened game developers have expressed their approval of this approach, because there are no
inbuilt constraints. It can be more daunting for newer users who just want to build another FPS-style game, but for those people there are a growing number of existing frameworks using OGRE which provide a complete solution using a given combo of libraries; but it's important
to realise that OGRE itself will always remain separate, flexible enough to be incorporated into any of these. The principle is of collaboration and integration with other libraries, rather than
assimilation of them, a standard tenet of component-based design.
Why should I consider using OGRE (rather than the other zillion 3D engines out there)?
Many other engines, whilst technically impressive, lack the cohesive design and the consistent documentation to allow them to be used effectively. Many of them have long features lists, but have the feel of a bunch of tech demos lashed together with twine, with no clear
vision to hold them together. Like any other software system this becomes their downfall as they become larger. Most other engines are also designed for one particular style of game or demo (e.g.
first-person shooters, terrain roamers).
OGRE is different. OGRE is design-led rather than feature-led. Every feature that goes into OGRE is considered throughly and slotted into the overall design as elegantly as possible and is always fully
documented, meaning that the features which are there always feel part of a cohesive whole. Quality is favoured over quantity, because quantity can come later - quality can never be added in retrospect. OGRE uses sound design principles learned, tried and tested many times
in commercial-grade software - the object-orientation mentioned in it's moniker is just one of those approaches - frequent use of design patterns is another. The core development team is kept deliberately small, and all of its members are veteren software engineers with many
years of real-world experience. Patches are welcomed from community, but they undergo a strict review for both quality and cohesion with the Ogre philosophy before being accepted.
OGRE does not assume what type of game or demo you want to make. It uses a flexible class hierarchy allowing you to design plugins to specialise the scene organisation approach taken to allow you to make any kind of scene you like. Want to render indoor levels fast? Fine, use the BSP/PVS plugin scene manager which has already been written. Want an outdoor landscape? Again, use another plugin scene manager. The rest of the engine continues to function exactly as before.
So the short answer is - if you favour design quality, flexibility and clear documentation, choose OGRE. You know it makes sense. ;)
Is it really free?
The Ogre source is made available under the GNU Lesser General Public License (LGPL), which basically means you can use it however you like as long as release the source for changes you make to the core engine if you distribute your product. The source to your application or to new plugins you create does not have to be released (although it would be nice if you did). See the licensing page for full licensing terms.
The Aegean Sea was criss-crossed with trading routes, galleys full of goods made port, which were then transferred by caravans overland to reach their inland destinations. As always where there are goods and money, there are bandits and marauders.
Yes, your precious caravans can be intercepted by pirates stealing your badly needed resources, on land or at sea. Sometimes it’s small independent groups of bandits working alone. More often than not however, it can be your opponents trying to disrupt you by attacking a soft spot.
If you rely on regular supplies of certain resources through trading and these are suddenly cut off, this can significantly hurt your position. Trade deals might be cancelled because losses are too high, crippling your economy and impairing the readiness of your army.
You don’t know where they might strike, but some precautions can be taken to safeguard your supplies. Try to use the shortest and safest trade routes available and keep military units garrisoned along them.
If you decide to employ these tactics yourself, be sure to use the best suited military units as bandits or pirates (look for high mobility and attack strength). To ensure the best possible odds of success, deploy them at locations where multiple trade routes congregate. Trade routes can be blocked by the deployment of units along borders or coastlines preventing traders from reaching their destination.
It’s not the most honorable warfare strategy but the end justifies the means, right?
Is it possible to have a truce that binds all and everybody to hold their peace even in such a warmongering world as the ancient Greece? The year of the Olympic games was a special one. Not only that the ground of the games was sacred but all states felt privileged to send their best athletes to compete for the olive wreath.
To honor the spirit of the games, all states are welcome to participate, even the dreaded barbarians and feared Persians. Of course, they all have to pay a heavy contribution to the organizers but winning means you bested the strongest, the fastest and the most agile.
Every four years this great competition takes place and if you can pay the entry fee, you can join the ranks of the best ones – even if only for a brief moment.
Victory in the Olympics is far more important than you might think. It is a matter of immense prestige not only for the sportsman himself but for his whole country and it is worth the extra spendings. Your reputation and influence will soar to the sky (not mentioning the solid pot of gold that will land in your coffers).
The Olympics give you a chance to stand out and shine.
Generals are truly multifunctional units. One of their great strengths lies in their power to stir unrest in foreign cities.
The grass is always greener on the other side of the fence and local governors are often greedy opportunists who can be convinced to change sides, without the need to use force.
Send a General to another country – friendly or enemy – he can provoke rebellious moods, bribe and persuade. The closer he is to the city, the more convincing are his arguments. If he is given enough time, he can be very successful in his mission, especially if the cities are already unhappy with their current management or government. Such a city can decide voluntarily to join your empire, without a drop of blood being spilled.
Naturally, such subversive behaviour will not go unnoticed by the foreign government so you should be careful not to expose your General too much. You can expect a decline in the relations of your countries and it is up to you to decide if one or two cities is worth the risk of making yourself another enemy. But the General is ready to serve you!
However, even the brave General is not immune to bribery. The more powerful he becomes, the more proud and unbending he will be and such a man can be easily swayed to switch sides. Don’t take the loyalty of your great commanders for granted!
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