Creating 3d video games 4 - Modeling the farm

In this lesson we will start modeling our farm. Previously I stated we will be using Blender for the modeling but due to technical issues with Blender and it's overall not user friendly interface I decided to model with another free 3d Modeling package. I will still be using Blender for animation and model conversion but for Modeling I will be using an oldie but goodie Deled 3d. You can download Deled 3d from http://www.delgine.com/

Keep in mind this guide is not intended to be a full 3d modeling tutorial. I'm going to assume you know some basics , if you want to learn more about modeling with Blender and Deled 3d there are lots of tutorials available online and creating another tutorial would just be reinventing the wheel.

To start we are going to create the basic farm exterior. I'm going to use a square instead of a rectangle. Once you have loaded Deled 3d go to the create/edit panel and under the item creation panel select Rectangle.

Next select the top view window. Before we draw the rectangle make sure the snap to grid function is enabled. You can toggle it on or off with f8 or go to view > options > environment and select snap to grid. Snap to grid will automatically position our shape along the lines of the windows grid. In top view we want to create a square 16 x 16 units long. Hold the left mouse button down then drag the mouse 16 squares down and 16 square to the right. Try to position your square to the center of the screen.

Try to keep the Rectangle close to the grid lines as possible. Don't be concerned if you're a little off. The snap to grid function will correct this for you. Select the 3d view the hold the right mouse button then move the mouse to pan your camera view down. You should see the rectangle in center of the screen.

Now we are going to create the fence on the border of the farm. To do this we are going to use a series of rectangles which will paste a repeating texture of a fence onto. Like I said nothing fancy. Select front view window and select Rectangle from item creation. Now draw a rectangle 1x2 units on the grid(1 high 2 wide).

Shift left click the rectangle you just created to select it. In the geometry tool box make sure the MOVE option is selected. Now move the rectangle to the back left corner of the farm. You can do this by holding the left mouse button and dragging the mouse. Use the top and front view to move the rectangle and snap to grid will help you place the rectangle on the corner.

The picture about is how the model should look so far. Now we will use the extrude tool to create a series of rectangle polygons. Select the rectangle then under the create/edit panel select edge in the edit mode tab. In the geometry toolbox select extrude. Select the front view and use the middle mouse button to zoom towards the rectangle. Each edge will now have a square on its center. Select the right edge by left clicking the square at its center then hold the left mouse button down and drag the edge to the right two units on the grid. Release the mouse and the edge will snap to the grid. Repeat this process until the rectangle covers the entire back border or the farm.

Now we are going to copy this border and position it on each edge of the farm model. Select the rectangle border then press Ctl+C to copy it then Ctl+V to paste it. Make sure you select object mode from edit mode panel first. Using the top view port position the copied border onto the adjacent edge of the farm. Then press Ctl+V to make another copy. We need to rotate this copy first before we position it. In the geometry tool box select rotate the under the rotate properties menu(at the bottom of the create/edit panel) enter 90 into the Y box and press enter. Your border should be rotated parallel to left and right edge of the farm. Now position this border and repeat the same process for the other side. Once you are done your model should look like this.

Now we have our base for the farm we need to add some textures. In the next two tutorials. We will use Gimp to make a simple grass texture. Then we will learn how to paste a repeatable fence texture onto our farms border using UV wrapping.

Creating 3d video games 3 - Crash course in 3d graphics

Before we begin using Blender to model our 3d world let's cover some basic 3d graphic terminology. Having an in depth knowledge of 3d graphics isn't always necessary for creating video games but some basic knowledge is required. Even if you don't plan on creating or editing 3d models for your game I would suggest learning some of the basics to help you better communicate with your modeling team.

3d coordinates

A 3d coordinate system shows a location in 3d space by using three axises represented by X,Y and Z(x,y,z). The above graph shows a common 3d coordinate system.Where X is width , Y is height and Z is depth. Each axis is represented by a line. Where the three lines intersect is known as the origin. The origin is the center of our 3d world. In order to find a location in 3d space we start by counting out how many units (inches,feet,world) the object is from the origin. Note each direction is represented by a positive or negative. An object at position (10,-15,5) Would be 10 units to the right , 15 units below and 5 units forward of the center of origin.

Polygon or Face

Polygons or faces are any shape with a flat surface. Above we have some examples of polygons. A polygon can have an unlimited number of sides but must have at least 3 sides. The most basic polygon shape being a triangle.

Edge or Line

An edge is represented by a line. These lines make up the border of our polygon. For example our triangle has 3 edges. These are the three lines that connect to make up our shape.

Vertex or Point

A vertex (plural vertices) is represent by a single point in 3d space (x,y,z). Look at the image above you will see white dots that mark where each edge connects. This white dot represents a vertex. Vertices represent where two or more edges connect.

Model

A model is a 3d object made up of polygons. Models can be something simple such as a cube or plain or complex such as a human or animal. Below is a wire frame 3d model of simple cube. The vertices have been marked. Notice it is possible for polygons to share edges and vertices with other polygons.

Now you have learned some basic 3d terminology we will move on to creating our first 3d stage. For those of you who would like to learn more about 3d graphics visit http://chortle.ccsu.edu/vectorlessons/vectorindex.html The people at Central Connecticut have provided a free course along with download in computer graphics.

Creating 3d video games 2 - Story and concept

Before we begin making our video game we need to have a story or plot to set the game to. Since we are creating a small simple game our story will also be short and simple. The background for our game begins when a hostile alien race lands on earth and plants a virus onto farmer Jenkins dairy cows. The cows are now transformed into bloodthirsty killers whose only goal is to wipe humanity off the face of earth. In an effort to contain the killer cows you have been employed by the local authorities to destroy all the cows on Jenkins farm.
Now we have our story we can work out the basic concept and game setting. Since we only have one area for our game(Jenkins farm). Our game will consist of one stage. A farm setting will also be easy to create. Only few structures such as barns and some fences will be needed. Now is a time when you will want to rough draft your stage design on paper. I already have my stage design laid out. A rough draft doesn't need to be super detailed or fancy this is just an abstract blueprint for your game. Here is my first draft of  Jenkins farm.

Red = barn
Yellow = hay bail
Green dot = tree
Brown = fence

I have a simple rectangle shaped farm surrounded by a fence. Inside the fence I have a couple barn structures and hay bails. I added a few trees for extra detail. This is the basic layout for the farm. More detail and structure can be added as necessary.

Now we have our plot and a basic layout for our game stage we need to determine what type of game this will be. I chose to make this game in the style of a first person shooter. This will require less character animation and first person shooters are overall easier to make.

Finally we need to determine the overall objective of the game. We want to kill all the cows but to make the game more competitive I will have a reward system. You get money for each cow kill and a bonus for completing the stage fast. You will also receive bonus money for accuracy. The more shots you land the more money you receive. The goal of this game will be to complete the stage as quickly and accurately as possible.

Some optional things you can add into the game will be power ups or different weapon types. Since we are trying to keep the game as simple as possible for learning purposes we will use only 1 weapon and no power ups.

Now we have a story and game concept let's start creating our farm stage. In the next lesson you will get a crash course in basic 3d graphics.