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Member Since 07 Jan 2000
Offline Last Active Dec 18 2014 07:06 AM

#4176634 Chunked LOD with Procedural Planets

Posted by Ysaneya on 08 March 2008 - 03:48 AM

Original post by EmptyVoid
But what I'd really like to know is why you rebuild the index buffer every time you update the chunks

I don't. While conceptually there is one VB/IB per chunk, you will quickly notice that when you're restricting terrain patches to have at most a LOD level difference <= 1, you have 16 possible IB combinations (north/east/south/west = 4 directions, and for each, the adjacent patch is at the same LOD level, or at +1 LOD level, so that's 2^4 combinations). So I precalculate those 16 IBs, and at render time only find which of the 16 combination my patch is in, and use the appropriate IB.


#3164311 Combining Rotation Matrices

Posted by Ysaneya on 19 July 2005 - 10:36 AM

What do you mean by "doesn't seem to work" ?

One thing you can try is to convert your two matrices to two quaternions, do a slerp between these, and convert back to a matrix. It might behave better.


#259500 The ultimate collection of links related to space

Posted by Ysaneya on 25 July 2004 - 11:12 AM

Post your links that might be helpful for the development of games based in space - whether it is for art, procedural generation or just informations about our universe. I'll keep the original post updated as more people post their links, and try to categorize them. I'll start with mines.


Resources: textures/models/concept art or useful photos

Concept art on Star Trek's spaceships Astronomical images: lots of photos.. you have to dig.

NASA Breakthrough Propulsion Physics Project Art: concepts about distortions due to propulsion

Global Topographic Data: to get very detailed heightmaps of a region of Earth.

Planetary maps: textures to map on planets. It has a few moons textures (Io, Europa, Ganymede, Callisto).. which are hard to find.

Space and technology Generators: to generate descriptions randomly. Funny for 5 mins.

Being an Informal Examination of Offensive Systems for Use in Deep-space Combat: a review of popular space weapons and how realistic they are.

Creating 3D planets in photoshop: a short tutorial to create a planet background.

Making a realistic starfield: the best photoshop tutorial to make a good space background, ever.

Texture maps of Earth and Planets: 2500x1250 textures of some planets

Blue Marble (NASA Earth dataset): 8192x4096 textures of Earth

Celestia Earth textures: 43200x21600 textures of Earth (HUGE downloads!)

Astronomy picture of the day: every day an image/photo

Science and nature: space (BBC site): a lot of interesting/comprehensible infos for the amateur

Planetary image maps: generally 1024x512 textures, bumps, specular and cloud maps of most planets. NEW

sci.astro.research: a newsgroup for astrophysics research NEW

A collection of space links: a lot of useful links but you have to dig NEW

Space Art: a good inspiration NEW

Solar Voyager Tutorials: very useful from the artist's point of view. Be sure to check out the How to make a planet tutorial. NEW

The NASA's Bluemarble ftp site (direct link): This is the ULTIMATE link if you're looking for high-resolution Earth datasets. The ftp site is slow to connect but works. You can get heightmaps, texture maps, cloud maps, normal maps and light maps of the full Earth at a resolution of 1 km (43200x21600 texels). 


NEW About books, movies or games

Logos for spaceships: related to the Empire in Foundation by I. Asimov

Known Spacer worlds: the worlds found in Foundation by I. Asimov

The Grand List of Overused Science Fiction Clichés: worth a read (and a laugh) if you design a space-based game

Sirroco Station: fan site for the game serie "Elite" of D. Braben

A list of space-based games.. commercial or not: one of the biggest list i know speaking of the "competition".

Watch the Elegant universe: a serie of videos explaining space and astrophysics NEW



Is the speed of light constant? NEW

Frequently Asked Questions in Cosmology NEW

Astronomical Constants and Tables: a table with the value of important constants, as well as planetary orbital elements, all summed up in a single page NEW



A list of nearby galaxy groups (within 100 millions LY)

Atlas of the universe: infos about our universe and its structure

A galactic model



Volume visualization of the Orion Nebula: if you wondered how a nebula looks in 3D, this is an absolute "must see".

Making a nebula texture in photoshop: extremely interesting if you plan to generate nebulas procedurally.

The Orion Nebula (photoshop tutorial): another tutorial to make a very realistic nebula texture in photoshop


Stars/Stars systems

A scale model of the solar system: with a nice applet showing orbits.

Wikipedia: what's a binary star How to compute planetary positions:


The ultimate link for the programmer: how to generate the positions of the planets in our solar system given a specific date

Globular Clusters: a list of known stars clusters.

The Magnitude System: nagivate the other pages on the same site, you'll find tons of infos, often understandable for the amateur, about stars properties (not only magnitude)

JPL Solar System Simulator: or the NASA's own simulator. Can render our solar system from any viewpoint. Uses a web interface.

ARVAL Catalog of Guide Stars: a list of "common" names for known stars.

The 100 nearest star systems: data for the.. the 100 nearest star systems (what did you expect?).

Data for important stars: 333 stars, and one page of description with data for each.

How Stars are Named: stellar nomenclature.

A solar system generator with RPG rules: extremely useful but uncomplete

Notable Nearby Stars: a mine of informations about nearby systems NEW

Computing planetary positions, a tutorial with worked examples NEW



Keplerian/Orbital elements and orbits: interesting.. for its diagrams.. or for the expert.

The living Earth: a short description of how colors are affected by the atmosphere for aerial views.

Fractal Models of Natural Phenomena: some infos on how to use fractals/procedural noise to generate planet's heightmaps

Earth rendering in Maya: has very good infos on how to apply different layers of textures and to blend them to make a realistic Earth.

Guide to extrasolar planets: infos (and VRML presentations) of extrasolar planets/systems. NEW

Computing planet positions using mean orbital elements: equations and code to compute planetary positions in 3D NEW

Use defined astronomical functions in Excel: VBA code for computing planetary positions too NEW

An applet to visualize orbits: with more on the same site NEW

The Nine Planets: important data and infos about planets, and harder to find, their satellites! NEW


3D Engines or software

Magrathea Simulation Engine Geofusion: looking very good but hem.. you need the satellite photos that go with it smile.png

Celestia: an astronomy software that contains a large set of accurate space objects.

Hallo Northern Sky software page: a free planetarium for Windows NEW

Stellarium: a competitor of Celestia NEW




PS.: i still have more at work but i'm currently in vacation.. you'll have to wait 2 weeks before i can update this list with my other links.

[edit by dwarfsoft] fixed the first link in the "Planets" section ... one too many <a href=" 's ;) [/edit]