-Aha, may be time to pick the best posts of the week so far from big sister site Gamasutra and elsewhere on our Think Services sites/blogs - with a number of neat features such as the 'Demystifying Portal' piece heading up the line-up.

Also in here - a further look at obstacles in games, an awesome Yasuhara interview, Gas Powered Games' Chris Taylor on the media talking directly to developers, Game Career Guide on the art of manual making, and lots more fun.

Erk splat googoo:

Gamasutra Features

Defining Boundaries: Creating Credible Obstacles In Games, Part 2
"Sidhe designer Griffiths (Gripshift) sparked much debate with his previous article on invisible barriers in games -- and he returns with an in-depth design article, examining practical solutions."

Sponsored Feature: Inking the Cube: Edge Detection with Direct3D 10
"In this Intel-sponsored feature, part of the Gamasutra Visual Computing microsite, Intel senior graphics software engineer Joshua Doss delves practically into techniques for edge detection, crucial for many approaches to non-photorealistic rendering."

Games Demystified: Portal
"In this neat technical article, Alessi deconstructs Valve's Portal -- including a demo and example source code -- to give a clear understanding of the physics principles behind the game's compellingly-executed teleportation mechanics."

Game Design Psychology: The Full Hirokazu Yasuhara Interview
"Unsung game designer Hirokazu Yasuhara, one of the 'original three' behind Sonic The Hedgehog, also helped make Western titles like Jak & Daxter and Uncharted - and gives Gamasutra a fascinating lecture on game design and fun."

Gamasutra/Other Original News

GPG's Taylor: Developers Should Interact More Directly With Press
"Controversy abounds when developers don't receive their deserved credits on a title -- but what about credit and acknowledgment in the press? Gas Powered Games' Chris Taylor (Dungeon Siege, Demigod) explains to Gamasutra why it's important, even essential, to allow development teams to speak directly with the media."

GCG: ‘The Professional Game Manual Maker’
"Belinda M. Van Sickle has one of those ‘other’ jobs in the game industry, the kind that doesn’t fit neatly into the designer-artist-programmer triangle. GameCareerGuide.com, Gamasutra’s sister site for game-related careers and education, has just posted an interview with her in which she talks about making video game manuals and documentation."

Devs And Pubs On Pitching Game Ideas: Be Persistent, Specialize
"Industry veterans like Foundation 9's Chris Charla, Capcom's Adam Boyes, Namco Bandai's Zack Karlsson, and DDM's Jeff Hilbert get practical with tips on what to do (and what not to do) when pitching your game to publishers. Among them: "If you can't pitch your game in seven seconds, you've lost."

Interview: Xbox 360's Japanese Saviors Talk Tales Series
"The Xbox 360 has seen an impressive Japanese hardware bump thanks to Tales Of Vesperia, and Gamasutra has been talking to Namco Bandai's Tales brand manager Hideo Baba and producer Tsutomu Gouda on Japan's fastest-selling Xbox 360 game and its Wii stablemate."