Finishing up

I used today to put my assets into UDK. This was not without its issues and one of the first issues I hit seemed to be related to the trouble I had with the pasted wheels and tracks mentioned earlier in this blog. Whilst everything else worked fine importing these parts of the model resulted in this ungodly mess

This was obviously frustrating so late in the project, particularly as it had worked fine in my earlier exports to udk. I opted not to combine both tracks and their corresponding wheels and this seemed to prevent the problem.

    I began to create a specular map for my model. this is not the finest work I have produced on this project however time was of the essence and I was adamant that all the textures on my object should be my own. This I applied to certain parts of my tank, it took a while for me to get the settings right however it worked eventually.

Now that I had my object properly placed in a UDK level I wanted to add more to the scene. I spent some some time trying to create a new terrain and alter it however due to my unfamiliarity with the program this took a lot of time and I found I was not able to apply a material to it the same way as I had with my tank model. I decided to abandon this for now and instead just made a small enclosed area around the tank with some pre made UDK wall assets. I repeat. THE WALLS ARE READY MADE IN THE UDK AND PURELY THERE TO CONTRIBUTE TO THE SHORT FILM CLIP I WILL BE MAKING FOR THE LEVEL. I TOOK NO PART IN THE MAKING OF THESE WALL ASSETS. 

When I was learning about some of the UDK features in online tutorials I discovered some features like fog and lighting. Though this was not part of the project I felt I could try it out quickly so have created a very light foggy effect surrounding the tank area. I also learnt that I could move the players start point so it began in the tank area. Once this was done I added the collision meshes to my now completed UDK scene, then made a short video which has taken its sweet time to upload to youtube.

     I also went back into maya and created some nice mental ray images of my model as well as a couple of animated turntables just to document it outside of a game engine.

     It is pretty clear that I have not achieved everything I set out to do in the learning agreement. Whilst this is disappointing I am still very happy with the work I have done. Even though I am working into the final hours of this project window I am happy at least that I managed my time better than before and what I haven't achieved is not through lack of effort. My work in Maya has come on considerable since the start of this project and processes that would have taken me an age to complete beforehand I feel I could now achieve in a much shorter time frame. It is disappointing to not have been able to create the full scenery around my tank, or do more with texture, animate it or create the sequence trigger that I set out in my learning agreement. But I learnt a great deal already about game engines with which before I had no experience using.  Overall it would have been great to do more but I am still really pleased with what I have achieved.

Tank Texture

     I have found another great website which has helped me with my model. Here someone has made a tank the same model as mine which has been really helpful to look at.

More information on the model can be found here http://www.antos.ca/freebies.htm



I have now stuck in to the texturing process of my work. This has led to several different developments.

Problems
The first issue I ran in to luckily occurred whilst I was at Uni. Therefore Lothar was able to show me how to fix it. I am not sure how it happened but I had manage to parent a lot of the objects in my scene unintentionally. This led to problems when I tried to duplicate some of my textured objects but was relatively easy to fix.

The second issue came later. I had organised the different textured group objects into corresponding layers, When I was rearranging these however it became impossible to remove certain objects from a layer. I was able to fix this eventually just by deleting and recreating the layer.

Texturing
Throughout this project a lot of people have looked to the internet for textures to use on their model. I have spent a lot of time working on my tank in Maya and am really proud of how my abilities have developed because of this. In keeping with this it was really important to me that my textures should be completely made from scratch. This has taken up a lot of my time and has forced me to work further into the last week of my deadline then I had hoped for however it is still something I am glad I made the choice to do- and furthermore it has been another big learning curve for me within this project.

I found a really helpful tutorial online that was actually made for a tank model which can be found here: http://www.moddb.com/tutorials/all-texturing-tutorial. This gave a fantastic step by step guide to creating colour layers, metallic textures, variations in shades, chips and damage, plus dirt, grime, and mud layers. Applied to the model this creates a really pleasing effect.
     Decals
Another step mentioned in the tutorial includes decals. It is important that the model isn't completely bare of any insignia as this will look unnatural. It is also important that these details must have suffered similar wear to  the rest of the tank.

I looked at images like this to make sure I obtained the right kind of decals. In the end I opted for a minimal touch, just including the tank number and a small logo.

Though the tank will be the same colour pretty much all over, I have adjusted the shades slightly on the different texture layers so there is some variation.

It was important to take into account what part of the tank I am texturing and how its surface may vary. This image shows the wheels layer which I decided , as it was closer the the ground and the various terrain rubble, would be heavier affected by chips, scratch, mud and grime. Again it seems like a small difference but it really helps once the whole tank has been textured.

Ambient Occlusion

     As I was unwell during the week when our group received the lecture on ambient occlusions I had to catch up on this in my own time. This website http://www.3dtotal.com/tutorial/maya/video_tutorial_baking_ambient_occlusion/ambient_occlusion_01.php
was particularly useful when it came to going through the method which is actually fairly simple.
    
     An ambient occlusion applies a shadow effect to the model based on the ambient lighting, this can be applied to a texture map which should give it more depth when applied to a model. The next step for me was to try and apply this to my model.

This image is my model when the ambient occlusion shader is applied. Up to this point it works fine however I am hitting a problem when it comes to batch baking it. I believe, though am not completely certain, that based on the error message given, the problem is with some of the duplicated wheels which maya is "unable to locate".
    As I have spent a large amount of time and multiple attempts on this already I am going to work with my texturing anyway. I will look to fix this problem later on if I have time as I am concerned if I don't progress now I am going to run out of time.

Tank Research

I have been looking at extensively at images of tauchpanzers to help me with texturing it, and also to influence some touch ups to the model.

I have found in particular that model kits of these tanks have been particularly useful for establishing some of the key features of the tank. Whilst useful to a point a lot of the photographs of this type of tank tend to be very old and poor quality, and therefore very difficult to establish detail from. Another good thing is that model making is usually such a serious and painstaking hobby that the models tend to be very accurate and are therefore fantastic resources.

There are a lot of different versions and additional features for this tank so it is important to look at as many different versions as possible to get the right idea for my model.

This image shows some of the waterproofing that can appear on the tanks. It would have been really nice for this project to include some fabrics and materials, however at this point I would not have the time to do this. However it is something I would like to try in a future project.

I found this uncompleted model was particularly useful when it came to building the wheel struts, as this was generally hidden from view in most of the images I have found. I feel that paying attention to some of these extra details, even if they are not immediately visible, contributes to making my model a little more realistic and impressive.

I need to come away from this project with the model version of this.

More Tanking

Once I had decided to finish with the modeling I was advised to test the pieces out in UDK before I started work on anything else. The process for importing was pretty new to me in itself so I attended the Thursday tutorial with Lothar where we were shown how to do this. The process itself is pretty uncomplicated and just requires making an FBX export of the maya objects then opening this in UDK. We were also shown how to apply various maps to our object upon which I will go into more detail later.

The major problem I encountered was that segments of my model appeared to be missing. This is demonstrated in the picture below. The worse part of this was that it happened when I was supposed to be working at home for the day. I ended up coming into uni where Lothar was able to tell me where I had gone wrong.

The problem was with my mesh in maya. Some of the face normals had inverted and this had made them appear invisible within UDK. All this required was to select the affected faces and click normals> reverse. The picture below demonstrates how this appears when an object has the face normals visible.

Once this was sorted I carried on importing the various parts of my meshes, and continued to clear up any further inverted normals. Once I was satisfied they were all functioning correctly I was happy to start focusing on fixing my uvs.

 You can see some of the additional features of the tank in the picture below. Lothar advised me in one of our group crit sessions that I should be using as many as five or six different textures to complete the tank. With this in mind, once I had the various uvs mapped out I set about trying to arrange them into groups. Ideally I want them layed out as efficiently as possible so no space is wasted and the objects can make as much use as possible of the available texture.

 Another thing to bear in mind with the grouping of uvs was the pixel quality of the textures. Again this was brought up in our group crit where I was reminded to take into account what objects would use 1024x1024 textures, or 512x512 and so on. Obviously objects should be grouped with other objects that will be using the same. When it came to deciding how high quality the different parts should be the following site proved useful: http://freesdk.crydev.net/display/SDKDOC3/Asset+Guidelines

- "The texture size that you should use for an object is related to the .
amount of space that object will use on screen. For Crysis, Crytek aimed for a screen resolution of 800x600 pixels. Lets assume that the object will fill half the screens height at all time (600/2=300pixels); therefore, you should use at least a 256x256 screen ans 512x512 will be even better. The best case scenario will be to have 1 pixel on screen to represent one pixel in the texture. Of course this depends on how big the object is in all directions, as you cant reall translate the texture space in 2D directly to the amount of space it will use in 3D.
-Try to keep the texel ratios for all objects constant. This means that every object on screen uses roughly the same amount of texture pixels per meter. By doing this, you will ensure that all the objects have roughly the same sharpness on screen and that the textures dont look muddy
- Objects that are always on screen and at the same distance to the player (for example weapons) can use a higher texel ration in areas that are closest to the player (butt-stock, iron sights and the like)."

Due to the size of the tank, and the fact that the player will be able to study it relatively close up I decided the main body and turret would need to use a 1024x1024 map. meanwhile the other features could be smaller but I have not yet decide by how much.

I now have my uvs and objects all placed and grouped correctly so today I began creating my first texture. A  photoshop network can be created with maya so I can continually update the image in PS and check how it suits my model.

This takes me up to date for now, updates to follow

Tauchpanzer model

     As mentioned before I am creating a Tauchpanzer model for this project, I already created a quick trial version to see how I would cope with this and have begun working on the real thing the last couple of weeks, unfortunately I was pretty ill in this time and had to take about a week out. Nevertheless I have made reasonable progress and developed a better understanding of Maya- though I will need to speed up my pace if I intend to meet the deadline. The images below outline my progress so far:

The biggest problem to begin with was to find some decent reference images, although there were many useful side profiles, a detailed front view was much harder to find. In the end I opted for the the two pictured here which are actually different models, as our game story alternates history somewhat the tank doesn't have to be exactly the same so this will be fine.

Next I began creating the main body of the tank, this has been halved so once it is ready I can duplicate it and get a symmetrical mesh, as well as it halfing some of the work I need to do. Since doing this in my trial version we were given a lecture in which we were discouraged from using the boolean tool. This made things difficult as I had used the difference tool to create the wheel arches on that attempt and so here had to work out an alternate way of doing this.

Once I had sorted this I extruded the next level of the tank, the part on which the gun would be mounted. This was relatively easy, just a case of extruding some basic shapes from the main mesh and adjusting them to replicate the angles of the tank.

After this I made the gun for the tank, at this point one of our tutors Lothar helped me out, advising to make the extra features of the tank as separate objects, which would make a lot of the shapes easier to produce, therefor the gun shape you see are actually two separate meshes.

The object here is a section of the tank track, these can be duplicated and angled, then slotted together to create the tracks for the tank. Lothar pointed out to me that this shape has excess geometry, edges that aren't being used for anything, and these should be deleted in order to make the shape more efficient. I built this shape starting with a cylinder, this was useful as the pivot for the object is already centred within the cylinder which makes it easier when it comes to angling it.

This is the cog that drives the tracks on the tank. For this Lothar showed me how to soften/harden edges on a mesh to give it a more, less curved look.

Cogwheel at the back of the tank- again this is made of two different meshes

 Track support and main wheels. Found the centre of the wheels difficult.

This is the track pieces duplicated and angled to create the tracks. Unfortunately I need to redo these. the geometry isn't correct and I need to fix the uvs before duplicating the shape. This will save time later.

These five images show some of the extra details I have added to the tank. Once more these are all separate from the main mesh. I want the end result of this project to look really impressive and I feel that creating mass detail will help this.

Images like this I find quite inspiring as well as useful to show me what kind of standard I should be striving for.

Tank Trial

     As part of our new project we are required to create something where there is some kind of interactivity. For example design a level layout, or a small playable part of a mission. I have chosen to further some of the work I did in our last project and model the amphibious tank I made. As I am still not all that experienced with maya I have done a quick trial version to help me prepare for the real thing.

I began with pretty basic shapes with not too much detail which I have used to build the turret and the main body of the tank.

     Using the "chamfer vertices" tool I learnt how to make rounder shapes into the faces of the model from which I could extrude a rounder object like the gun, this is an improvement as before I would have just unioned another object onto it which would leave me with more difficult geometry.

These next two pictures demonstrate how I began making my tank track. I followed some steps that I found in a youtube tutorial: http://www.youtube.com/watch?v=BtG7vdwZsKw I basically started with a cylinder that I began to extrude faces from. The benefit of starting with the cylinder was that the pivot was already centralised within it which was handy when it came to rotating the tracks as in the picture below.

This picture shows the tank tracks all positioned, the next step was to place the wheels within them.

The wheels were pretty easy to make but I quite liked how they looked. This is where I decided to leave my model and begin working on the actual version, as I am particularly aware of the impending deadline.