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标题: Detailed cityscape creation [打印本页]

作者: 林伟贤 时间: 2014-1-28 09:11
标题: Detailed cityscape creation

Jean-Francois Liesenborghs takes us through the stages of creating a detailed cityscape scene.
Creating the buildingsFor creating a cityscape, I first created a set of specific buildings with between 5 and 10 different structures. I then began combining some of those structures to create other buildings.

An initial set of buildings for the city

It is always good practice to create a set of basic structures to start, and then combine them in interesting ways to create a more complex scene. This way, you have more control over the final city silhouette and it's easier to change one or two aspects if you need to, rather than having to deal with it on a whole.

Basement of the cityTo create the basement of the city, I first developed a basic plane with a sufficient number of subdivisions and then converted it to editable poly. I then selected a range of polys and extruded them to create channels and ridges in the mesh. As a tip; you can create different hierarchies and levels on your plane by extruding upper and lower other-poly regions.

I then duplicated the plane multiple times and resized some of those duplicated areas, and merged them all into one solid basement comprising of different sized polys.

Mass creation of low-detailed buildingsTo fill the city, there are 3 main techniques that you can use.

First, you can access the scatter modifier and apply the scatter to some simple buildings. Secondly, you can use the particle system with buildings modeled as particles. A third option is to use the free modifier Greeble.

For this city I chose to use the Greeble modifier option. I selected polys from the basement plane, inset them to leave space around the Greeble buildings, and then detached and cloned the polygons. I then applied the Greeble modifier to these detached polygons.

Using Greeble to place the buildings
By completing this process over and over with different-sized parameters and different region selections, I obtained my mass building effect.

Placement of buildingsI then began placing the buildings I created in Step 1 into my scene. I tried to spread them around in a coherent kind of way, by using some city references.

Use city references for sensible placement

Creating the background buildingsThe image above formed part of the background of my image that was later transferred to Photoshop. I duplicated some parts of the city in order to fill the entire page, and make the city look really wide-spread.

Creating the spaceshipFor the spaceship, I wanted to have something that resembled birds gently soaring across the sky. The basic modeling of these spaceships was very simple and I just added some light detail on specific parts.

The addition of spaceships added realism in the background

CompositionWhen all the modeled elements were complete, I combined them all together to create the basic composition. In terms of placement, I used the one-third composition rule and re-centered the image. This basically entailed positioning the object at an equal distance from each other and the edges of the page, to create an aesthetically pleasing effect.

Using the one-third composition rule for placement

LightingFor the lighting I used 3 lights positioned in 3 specific places: a front, a back and a left spot. The front light was the main one. To create more realistic lighting, I put a Noise map on my main spot which gave my image a diverse range of lighting levels on my city. This in turn gave the impression that there were clouds over the main light source/sun.

This shows the main light parameters used

TexturingFor the textures themselves, I decided to choose one multi-material that used the same kind of patterns and textures. I thought this would tie the various modeling styles in the city together through their similar textures, thus creating a cohesive scene.

The materials and textures added

The final model with light and texture added

I only used 3 render passes for this scene: Ambient Occlusion, ZDepth and Normal. These passes helped me create my final image in Photoshop.

Photoshop finalizationI then made a final render and saved it in TGA format in order to see the Alpha channel.

In Photoshop, I opened the TGA render and added 2 new layers; one with the Ambient Occlusion pass and another with the ZDepth pass. I inverted the ZDepth pass and used screen fusion. For the AO layer I used the multiply fusion.

Finally, I worked with the background city to create more depth and added the 2D sky and planet images to complete the composition.

Adding the background to complete the composition

The final imageMerging all layers and finishing post-production to create the final image.

The final image

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作者: may 时间: 2014-1-30 03:10
不错的教程呀！感谢分享

作者: 雅雅 时间: 2014-1-30 03:16
支持技术分享，希望有更多的交流

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