SketchUp Archives - Digital Urban

The Making of the CASA Oculus Rift Urban Roller Coaster

Andy — Tue, 26 Aug 2014 14:48:54 +0000

Earlier this year CASA was invited to create a virtual reality exhibit for the Walking on Water exhibition, partnered with Grand Designs Live at London’s ExCeL. While CASA has a tendency to spend a lot of time thinking seriously about cities and data it was quickly decided that a fun and novel way to engage the 100,000 or so expected visitors would be an urban roller coaster ride using the Oculus Rift Virtual Reality headset. Oliver Dawkins, a student on our MRes in Advanced Spatial Analysis is a leading light in urban visualisation and the Oculus Rift, as such he kindly offered to lead the development. In the following guest post, Oliver (of http://virtualarchitectures.wordpress.com/) talks us through the development process….

CASA Urban Roller Coaster from Virtual Architectures on Vimeo.The first tool chosen for this project was the Unity game engine because it provides a very simple means of integrating the Oculus Rift virtual reality headset into a real-time 3D experience. Initial tests were made in Unity with a pre-made roller coaster model downloaded from the Unity Asset Store. However, rather than simply place that roller coaster in an urban setting I wanted to create a track that would be unique to this experience and feel like it might have been part of the urban infrastructure. Due to time constraints it was not possible to model the urban scene from scratch. Instead I decided to generate it procedurally in Autodesk 3ds MAX using a great free script called ghostTown Lite.

Although I like to use SketchUp for 3D modelling wherever possible 3ds MAX was much better suited to this project as it allowed me to quickly generate the city scene, model the roller coaster track, and animate the path of the ride, all in the one software package. After generating the urban scene I used the car from the Asset Store roller coaster as a guide for modelling my track in the correct proportions.

The path of the ride through the city was modeled using Bezier splines, first in the Top view to get the rough layout and then in the Front and Left views to ensure the path would clear the buildings in my scene. The experience needed to be comfortable to users who may not have experienced virtual reality before so it was agreed to exclude loop-the-loops on this occasion. It was also important to avoid bends that would be too sharp for roller coaster to realistically follow. Once I was happy with the path I welded all the vertices in my splines so that the path could be used to animate the movement of the roller coaster car along the track later.

Next sections of track were added to the path I’d created using the 3ds MAX PathDeform (WSM) modifier. As the name suggests this modifier deforms selected geometry to follow a chosen path. Using this modifier massively simplified the process by allowing my pre-made sections of track to be offset along the length of the path and then stretched, rotated and twisted to fit together as seamlessly as possible. This was the most intricate and time consuming part of the project.

In order to minimise the the potential for motion sickness with the Oculus Rift I was careful to keep the rotation of the track as close to the horizontal plane as possible. Supporting struts were then arrayed along the path of the track and positioned in order to anchor it to the rest of the scene. When I was satisfied a ‘Snapshot’ was made of the geometry in 3ds MAX to create a single mesh ready for export to Unity. At this point the path deformed sections of track could be deleted as Unity does not recognise the modifier.

To create the movement of the roller coaster car along the track a 3ds MAX dummy helper was constrained to the path I’d created earlier. This generated starting and ending key frames on the animation timeline. The roller coaster car model was then placed on the track and linked to the dummy helper. It is possible in 3ds Max to have the velocity and banking of the dummy calculated automatically, but I found that this did not give a realistic feel. Instead I controlled both by editing the animation key frames using a camera linked to the dummy for reference. This was time intensive but gave a better result. The city scene, roller coaster and animation were exported as a single FBX which is the preferred import format for 3D geometry in Unity.

Having completed the track and animated the car it was time to assemble the final scene in Unity. First I generated a terrain using a great plugin called World Composer. This enables you to import satellite imagery and terrain heights from Bing maps to give your backdrops a high degree of realism.

The urban scene and roller coaster were then imported and a skybox and directional light were added. The scene was completed with various assets from the Unity Asset Store including skyscrapers, roof objects, vehicles, idling characters and a flock of birds.

To prepare the Oculus Rift integration the OVR camera controller asset from Oculus was placed inside and parented to the roller coaster car. In my initial tests with the Asset Store roller coaster I’d found that OVR camera would drift from the forward facing position. This would disorientate the user and contribute to motion sickness. To prevent it with a quick fix I parented a cube to the front of the roller coaster car, turned off rendering of the cube so it would be invisible, and set the camera controller to follow the cube.

In order to ensure the best possible virtual experience it is really important to keep the rendered frames per second as high as possible. As the Oculus Rift renders two cameras simultaneously, one for each eye, you need to aim to render 60 fps in Unity so as to ensure the user can expect to experience a frame rate of 30 fps.
In order to achieve this I took advantage of occlusion culling in Unity Pro which prevents objects being rendered when they are outside the camera’s field of view or obscured by other objects.

I also baked the shadows for all static objects in the scene to save them as textures which saves the processor calculating them dynamically. The only objects casting dynamic shadows are the roller coaster car and animated characters.
Finally two simple java scripts were added. The first would start the roller coaster and play a roller coaster sound file upon pressing the ‘S’ key. The second closed the roller coaster application upon pressing the ‘Esc’ key.
The reception of the CASA Urban Roller Coaster ride at Grand Designs Live was fantastic and I’m really pleased to have participated. It was a great project to work on and an excellent opportunity to learn new techniques in 3ds MAX and Unity. Having my first VR roller coaster under my belt I’m looking forward to building another truly terrifying one when I get the time, hopefully for the Oculus Rift DK2 which has just arrived at CASA.
On a last note I’d like to thank Tom Hoffman of Lake Earie Digital whose excellent YouTube tutorials on creating roller coasters in 3ds MAX provided a great guide through the most difficult part of this challenging project.
You can follow Oliver’s latest work at http://virtualarchitectures.wordpress.com/…..

The post The Making of the CASA Oculus Rift Urban Roller Coaster appeared first on Digital Urban.

UCL Live Campus Augmented Reality App – Created by Masters Students at CASA

Andy — Thu, 20 Jun 2013 08:23:03 +0000

UCLive is an Augmented Reality Map of UCL developed by students on the Masters in Advanced Spatial Analysis and Visualisation at CASA. Featuring live data, the augmented reality android app works by simply pointing your mobile device at any of the UCL maps across campus.
Running in Unity and mixing a number of GIS and Agent Based Modelling elements, the development is outlined below:

A three dimensional base model was created with SketchUp on top of the UCL campus map;
Moving agents and transports are added into the application to show local bus and tube routes;
Sounds are embedded into the application from the UCL Soundcloud;
Online data on buildings, Twitter and PC Cluster availability – live;
The user’s location is shown in the application map.

Augmented Reality UCL Map

Produced by Ayana Kito ( http://3rdplat.blogspot.co.uk ), Balamurgan Soundararaj ( http://geoidin.wordpress.com ), Daniel Lam ( http://spatiametrics.wordpress.com ) and Nicola Clark (http://cityofblindinglights.org ) it represents the output of the final visualisation project on the masters course. The movie illustrates the app in action:
Take a look at the main UCLive page for full details and updates, we are currently exploring next steps to move the app towards release on Android and iOS.
You can still apply for 2013/14 entry to the MRes in Advanced Spatial Analysis and Visualisation the final full time deadline for applications: August 2nd.

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How to export model from Google SketchUp to CryEngine 3 Tutorial HD (PlayUp Tools)

Andy — Fri, 08 Jun 2012 11:43:00 +0000

The clip below details how to go from SketchUp to CryEngine 3 using PlayUp tools – a quick and easy route direct into the game engine:

http://www.playuptools.com/ – playup tools
http://sketchup.google.com/ – google sketchup

Thanks go to @TimothyMDevlin for sending us a tweet with the link…

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SketchUp 8: Full Building Maker Integration

Andy — Wed, 05 Jan 2011 10:28:00 +0000

We have just fallen in love with Google SketchUp all over again, we are slightly late to the table on this one but Google Building Maker is now fully integrated into SketchUp 8. It has the genius of Canoma with the addition of all the editing functions that come with SketchUp and its free:

Combine this with the free version of Unity and you have a very powerful toolset. Talking of which, we have just downloaded Unity 3.0 to further develop our agent based modelling exhibition space, its good to be back….

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SketchUp 8: Full Building Maker Integration

Andy — Wed, 05 Jan 2011 10:28:00 +0000

The post SketchUp 8: Full Building Maker Integration appeared first on Digital Urban.

SketchUp Realtime Lighting: LightUp

Andy — Fri, 03 Sep 2010 08:56:00 +0000

Game Engines such as Unity make the perfect platform to create a virtual exhibition space. Spaces where architecture, urban models and urban furniture can be displayed and viewed alongside movies and sound-scapes to provide a sense of place.

Google SketchUp is our current tool of choice for modelling internal spaces, the combination of quick and easy modelling with lighting simulation via LightUp provides the perfect work flow.

LightUp is remarkably easy to use, you can simply click on any textured shape and allow it emit light, opening up the way for quick and easy renders out of SketchUp.

Of note is the ability to run LightUp in the free version of SketchUp allowing models to be exported in .fbx without having to upgrade to the pro.

Head over to http://www.light-up.co.uk/ for full details. We will have more on our exhibition space as it develops.

The post SketchUp Realtime Lighting: LightUp appeared first on Digital Urban.

SketchUp Realtime Lighting: LightUp

Andy — Fri, 03 Sep 2010 08:56:00 +0000

Google SketchUp is our current tool of choice for modelling internal spaces, the combination of quick and easy modelling with lighting simulation via LightUp provides the perfect work flow.

LightUp is remarkably easy to use, you can simply click on any textured shape and allow it emit light, opening up the way for quick and easy renders out of SketchUp.

Of note is the ability to run LightUp in the free version of SketchUp allowing models to be exported in .fbx without having to upgrade to the pro.

Head over to http://www.light-up.co.uk/ for full details. We will have more on our exhibition space as it develops.

The post SketchUp Realtime Lighting: LightUp appeared first on Digital Urban.

iClone City Packs

Andy — Wed, 01 Sep 2010 10:24:00 +0000

iClone combines 4 video production with 3D real-time animation, the software integrates with various 3D packages, including SketchUp and provides a quick and easy way to add animation to scenes.

The clip below provides an overview:

Of particular note are the city expansion packs, allowing complex cityscapes to be built quickly and easily.

City Blocks Vol. 1-Skyscrapers in Metro City:

For more information head over to http://www.reallusion.com/iclone/

Also take a look at Reallusions uploads to the Google 3D Warehouse, there are a range of useful street, park and city elements.

The post iClone City Packs appeared first on Digital Urban.

iClone City Packs

Andy — Wed, 01 Sep 2010 10:24:00 +0000

iClone combines 4 video production with 3D real-time animation, the software integrates with various 3D packages, including SketchUp and provides a quick and easy way to add animation to scenes.

The clip below provides an overview:

Of particular note are the city expansion packs, allowing complex cityscapes to be built quickly and easily.

City Blocks Vol. 1-Skyscrapers in Metro City:

For more information head over to http://www.reallusion.com/iclone/

Also take a look at Reallusions uploads to the Google 3D Warehouse, there are a range of useful street, park and city elements.

The post iClone City Packs appeared first on Digital Urban.

How the 3D Engine is Changing the World: The Guardian

Andy — Fri, 11 Dec 2009 14:48:00 +0000

Keith Stuart has a good article in today’s Guardian Newspaper entitled ‘How the 3D Engine is Changing the World’. Keith notes that John D Carmack, the programming legend behind the Doom and Quake games runs an aerospace company as a relaxing diversion from his role as technical director at games developer, id. Which goes to show that 3D engine design isn’t rocket science – it’s far more complicated than that.

You can read the full article online, including our thoughts on Google SketchUp….

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