|By Mike Jacobs||
|July 31, 2005 07:15 PM EDT||
We Need More Power, Scotty!
Let's extend our particle system design to incorporate Shape3D particles. We still want to easily add the particle system to the Java3D scene, and reuse as much of what we've done up to this point. Recall that our particle systems use an emitter to control the initial position and velocity of the particles. The point and motion blurred particle systems deal with pixel size particles so we'll have to create a new type of particle system to handle Java3D shapes. So far, the particle systems have been Shape3D objects, so how can particles be any Shape3D object? Java3D supports the aggregation of shapes into a Group.
As you can see from Figure 6, the Shape3DParticle-System is a subclass of the Java3D Group class to allow shapes to be grouped together into a particle system. By implementing the IParticleSystem interface, the Shape3DParticleSystem can use the particle emitter unchanged. To help organize and control the shapes, the shape particle system maintains a scene graph segment for each shape in the particle system. Each shape has a scene graph segment consisting of a branch group to maintain membership in the particle system and a transform group to control the location, scale, and rotation of the shape.
Because particles are born and die during the particle system life cycle, shapes must be added and removed from the scene during the animation. Java3D limits the changes to the content of live scene graphs to branch groups. Provided the group (the particle system) has the ALLOW_CHILDREN_EXTEND and the ALLOW_CHILDREN_WRITE capabilities set and the branch group has the ALLOW_DETACH capability set, the branch group and its children can be added or removed from the scene. For our purposes, the only child of the branch group is a transform group. The transform group maintains the standard Java3D translation, scale, and rotation attributes of its child shape in a Transform3D object. With this structure in place, let's briefly review the Reeves life cycle for our new shape particle system.
Emit New Particles
From Figure 6 you can see that the shape particle system implements the IParticleLifeCycleListener interface. The particle emitter notifies listeners as particles evolve through their lifetime. This notification can be used to create additional effects such as spawning additional particle systems. Just before particles are emitted, the aboutToEmit() method is called on the listener, passing a list of particles to be emitted. The shape particle system reflects the initial particle position in the transform group and adds the branch group, transform group, and shape to the scene.
Bury the Dead Particles
When the particle emitter is ready to bury dead particles, it notifies listeners of their impending demise by calling the aboutToDie() method. The shape particle system takes the news pretty well by removing the branch group for the particles from the particle system, removing the shapes from the scene. To reduce object creation, the shape, transform group, and branch group are recycled for a future reincarnation.
Update the Surviving Particles
While particles are alive, the particle emitter applies the influences and the particles are moved, scaled, and rotated. After the particles have been updated by the particle emitter, it notifies the listeners by calling the updated() method. The shape particle system reflects the new particle position, scale, and rotation in the transform group. We discussed how linear acceleration and velocity of a particle can affect its new position, but how about rotation?
Slicker Than Euler
Realistic rotation of Shape3D particles with Euler angles can be mathematically intensive and computationally expensive. I'll try to keep the math to a minimum but if you are interested in the details, have a look at the references. If you have read much about three-dimensional graphics, you've probably already heard of Euler angles. An example of Euler angles is the yaw, pitch, and roll used to describe the orientation of an airplane. There are a few problems with using Euler angles that make them difficult to use for animation.
The order in which Euler angle rotations are applied can result in different orientations. While applying the rotations, a degree of freedom can be lost to something called a "gimbal lock". Over the course of multiple rotations, numeric corrections are often needed to keep the rotational animation looking good. Too make matters worse, it's computationally expensive to interpolate between orientations. Chris Hecker summed it up pretty well: "It's possible to prove that no three-scalar parameterization of 3D orientation exists that doesn't suck, for some suitably mathematically rigorous definition of suck." I did say that I would try to keep the math to a minimum. While Euler angles are easy to understand, we need something that overcomes the weaknesses of using Euler angles for rotational animation. This is where something called a quaternion can save the day (see the sidebar: Pop Quiz Hot Shot).
A quaternion is an extension to complex numbers consisting of a vector and a scalar. There's no use trying to picture a quaternion because it exists in four-dimensional space. In the spirit of keeping the math to a minimum, let's review the key features of quaternions. A unit length quaternion is perfect for representing a rotational orientation of an object. Java3D supports a unit quaternion with the Quat4f class. As the name implies, it consists of four floating-point numbers to make up the vector and scalar components of the quaternion. It's straightforward to convert Euler angles to a quaternion as shown in Figure 7.
Performing successive rotations with quaternions is as easy as multiplying them together. When compared to the traditional rotational matrix approach, quaternion multiplication (the details of which we won't cover here) and orientation interpolation is much more efficient, making it ideal for animating our rotating particle shapes. To animate the rotation, we need to specify the angular velocity in the vector portion of a quaternion. The angular velocity quaternion used to calculate the time differential of a quaternion is shown in Figure 7. The time differential can be used to interpolate quaternions, which helps us spin objects. That was probably the world's shortest description of quaternions, so be sure to review the references if you need more detail. Let's put this new knowledge to work in our shape particle system.
When shape particles are about to be emitted, the orientation is assigned through the use of Euler angles. The angular velocity is also assigned using the now familiar central value and variance approach discussed above. The orientation and angular velocity is converted into quaternions by the particle. When the particle is updated, the quaternion differential is calculated using the time interval of the particle system manager as described in Figure 7. Finally, the new orientation quaternion is set on the Transform3D of the shape along with the new position and scale and Java3D rotates the shape.
Vector3f translation = new Vector3f();
|mnjacobs 09/05/11 03:04:00 PM EDT|
The commercial version of this particle system is now available free including the source. Visit here.
|indie technologies 08/31/05 06:26:58 PM EDT|
http://www.indietechnologies.com now has this Java 3D technology available as a commercial product.
|indie technologies 08/06/05 07:05:33 PM EDT|
This technology is being commercialized for Java 3D game developers. Visit www.indietechnologies.com for more information.
|Java Developer's Journal 07/31/05 06:45:05 PM EDT|
Star Trek Technology for Java3D. The Star Trek universe has inspired many technology ideas but I'm disappointed I don't have a transporter yet. One Star Trek technology that has been available for sometime is the particle system. No, this is not an exotic propulsion system for your flying car. The particle system was invented to animate the Genesis effect in Star Trek II: The Wrath of Khan. While the Genesis device was used to transform a barren planet into one full of life, we can adopt this technology for more modest effects in Java3D.
|Mike Jacobs 07/11/05 09:04:30 AM EDT|
If you are looking for the source it is at the following link (my previous comment had a period at the end of the link).
|David Morris 07/01/05 09:25:29 AM EDT|
Mike, the stated link to the source code is invalid. Could you please update this link.
|Mike Jacobs 06/30/05 10:13:20 AM EDT|
The web editor decided to do things a bit different than the past. The first mention of the listings (Listing 1) is a link to all of the code. The link is http://res.sys-con.com/story/jun05/99792/source.html.
|Michael Yankowski 06/29/05 09:57:32 PM EDT|
I can't find any links to the source code.
|Mike Jacobs 06/16/05 11:32:10 AM EDT|
The source code is now current.
|Mike Jacobs 06/16/05 09:20:07 AM EDT|
It looks like the source for this article is slightly down level. JDJ is working on it.
Cloud computing is being adopted in one form or another by 94% of enterprises today. Tens of billions of new devices are being connected to The Internet of Things. And Big Data is driving this bus. An exponential increase is expected in the amount of information being processed, managed, analyzed, and acted upon by enterprise IT. This amazing is not part of some distant future - it is happening today. One report shows a 650% increase in enterprise data by 2020. Other estimates are even higher....
Aug. 31, 2016 01:45 AM EDT Reads: 3,067
Smart Cities are here to stay, but for their promise to be delivered, the data they produce must not be put in new siloes. In his session at @ThingsExpo, Mathias Herberts, Co-founder and CTO of Cityzen Data, will deep dive into best practices that will ensure a successful smart city journey.
Aug. 31, 2016 01:00 AM EDT Reads: 1,701
Identity is in everything and customers are looking to their providers to ensure the security of their identities, transactions and data. With the increased reliance on cloud-based services, service providers must build security and trust into their offerings, adding value to customers and improving the user experience. Making identity, security and privacy easy for customers provides a unique advantage over the competition.
Aug. 30, 2016 08:15 PM EDT Reads: 2,489
SYS-CON Events announced today that 910Telecom will exhibit at the 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. Housed in the classic Denver Gas & Electric Building, 910 15th St., 910Telecom is a carrier-neutral telecom hotel located in the heart of Denver. Adjacent to CenturyLink, AT&T, and Denver Main, 910Telecom offers connectivity to all major carriers, Internet service providers, Internet backbones and ...
Aug. 30, 2016 08:00 PM EDT Reads: 2,031
SYS-CON Events announced today that Pulzze Systems will exhibit at the 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. Pulzze Systems, Inc. provides infrastructure products for the Internet of Things to enable any connected device and system to carry out matched operations without programming. For more information, visit http://www.pulzzesystems.com.
Aug. 30, 2016 07:15 PM EDT Reads: 356
There is growing need for data-driven applications and the need for digital platforms to build these apps. In his session at 19th Cloud Expo, Muddu Sudhakar, VP and GM of Security & IoT at Splunk, will cover different PaaS solutions and Big Data platforms that are available to build applications. In addition, AI and machine learning are creating new requirements that developers need in the building of next-gen apps. The next-generation digital platforms have some of the past platform needs a...
Aug. 30, 2016 07:00 PM EDT Reads: 936
Data is an unusual currency; it is not restricted by the same transactional limitations as money or people. In fact, the more that you leverage your data across multiple business use cases, the more valuable it becomes to the organization. And the same can be said about the organization’s analytics. In his session at 19th Cloud Expo, Bill Schmarzo, CTO for the Big Data Practice at EMC, will introduce a methodology for capturing, enriching and sharing data (and analytics) across the organizati...
Aug. 30, 2016 06:15 PM EDT Reads: 372
Internet of @ThingsExpo, taking place November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with 19th Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. The Internet of Things (IoT) is the most profound change in personal and enterprise IT since the creation of the Worldwide Web more than 20 years ago. All major researchers estimate there will be tens of billions devices - comp...
Aug. 30, 2016 03:30 PM EDT Reads: 3,782
SYS-CON Events announced today Telecom Reseller has been named “Media Sponsor” of SYS-CON's 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. Telecom Reseller reports on Unified Communications, UCaaS, BPaaS for enterprise and SMBs. They report extensively on both customer premises based solutions such as IP-PBX as well as cloud based and hosted platforms.
Aug. 30, 2016 02:30 PM EDT Reads: 1,060
SYS-CON Events announced today that Adobe has been named “Bronze Sponsor” of SYS-CON's 18th Cloud Expo, which will take place on June 7-9, 2016, at the Javits Center in New York, New York. Adobe is changing the world though digital experiences. Adobe helps customers develop and deliver high-impact experiences that differentiate brands, build loyalty, and drive revenue across every screen, including smartphones, computers, tablets and TVs. Adobe content solutions are used daily by millions of co...
Aug. 30, 2016 02:00 PM EDT Reads: 3,816
Why do your mobile transformations need to happen today? Mobile is the strategy that enterprise transformation centers on to drive customer engagement. In his general session at @ThingsExpo, Roger Woods, Director, Mobile Product & Strategy – Adobe Marketing Cloud, covered key IoT and mobile trends that are forcing mobile transformation, key components of a solid mobile strategy and explored how brands are effectively driving mobile change throughout the enterprise.
Aug. 30, 2016 01:45 PM EDT Reads: 703
Pulzze Systems was happy to participate in such a premier event and thankful to be receiving the winning investment and global network support from G-Startup Worldwide. It is an exciting time for Pulzze to showcase the effectiveness of innovative technologies and enable them to make the world smarter and better. The reputable contest is held to identify promising startups around the globe that are assured to change the world through their innovative products and disruptive technologies. There w...
Aug. 30, 2016 01:30 PM EDT Reads: 892
Data is the fuel that drives the machine learning algorithmic engines and ultimately provides the business value. In his session at Cloud Expo, Ed Featherston, a director and senior enterprise architect at Collaborative Consulting, will discuss the key considerations around quality, volume, timeliness, and pedigree that must be dealt with in order to properly fuel that engine.
Aug. 30, 2016 01:15 PM EDT Reads: 2,075
19th Cloud Expo, taking place November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, will feature technical sessions from a rock star conference faculty and the leading industry players in the world. Cloud computing is now being embraced by a majority of enterprises of all sizes. Yesterday's debate about public vs. private has transformed into the reality of hybrid cloud: a recent survey shows that 74% of enterprises have a hybrid cloud strategy. Meanwhile, 94% of enterpri...
Aug. 30, 2016 01:00 PM EDT Reads: 3,245
Almost two-thirds of companies either have or soon will have IoT as the backbone of their business in 2016. However, IoT is far more complex than most firms expected. How can you not get trapped in the pitfalls? In his session at @ThingsExpo, Tony Shan, a renowned visionary and thought leader, will introduce a holistic method of IoTification, which is the process of IoTifying the existing technology and business models to adopt and leverage IoT. He will drill down to the components in this fra...
Aug. 30, 2016 10:30 AM EDT Reads: 429
With so much going on in this space you could be forgiven for thinking you were always working with yesterday’s technologies. So much change, so quickly. What do you do if you have to build a solution from the ground up that is expected to live in the field for at least 5-10 years? This is the challenge we faced when we looked to refresh our existing 10-year-old custom hardware stack to measure the fullness of trash cans and compactors.
Aug. 30, 2016 02:30 AM EDT Reads: 1,878
The emerging Internet of Everything creates tremendous new opportunities for customer engagement and business model innovation. However, enterprises must overcome a number of critical challenges to bring these new solutions to market. In his session at @ThingsExpo, Michael Martin, CTO/CIO at nfrastructure, outlined these key challenges and recommended approaches for overcoming them to achieve speed and agility in the design, development and implementation of Internet of Everything solutions wi...
Aug. 30, 2016 02:00 AM EDT Reads: 2,273
Today we can collect lots and lots of performance data. We build beautiful dashboards and even have fancy query languages to access and transform the data. Still performance data is a secret language only a couple of people understand. The more business becomes digital the more stakeholders are interested in this data including how it relates to business. Some of these people have never used a monitoring tool before. They have a question on their mind like “How is my application doing” but no id...
Aug. 30, 2016 01:00 AM EDT Reads: 1,961
DevOps at Cloud Expo, taking place Nov 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with 19th Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. The widespread success of cloud computing is driving the DevOps revolution in enterprise IT. Now as never before, development teams must communicate and collaborate in a dynamic, 24/7/365 environment. There is no time to wait for long dev...
Aug. 29, 2016 10:00 PM EDT Reads: 2,519
The 19th International Cloud Expo has announced that its Call for Papers is open. Cloud Expo, to be held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, brings together Cloud Computing, Big Data, Internet of Things, DevOps, Digital Transformation, Microservices and WebRTC to one location. With cloud computing driving a higher percentage of enterprise IT budgets every year, it becomes increasingly important to plant your flag in this fast-expanding business opportuni...
Aug. 28, 2016 10:30 PM EDT Reads: 4,103