In the previous two articles (article 1 and article 2) I have tried to introduce OpenGL ES on android. Now let’s take it further and build on them. In this article we will create a billboard (which is a square) and we will apply a texture onto it. A texture is nothing more than a bitmap image. When we work in 2D we set the Z coordinate to 0. We’ll cover 3D later. This is very useful to use in 2D games and is the preferred way to display images using OpenGL. It is very fast indeed.
In the previous articles we managed to display triangles. How to display a square then? A square is composed of 2 triangles.
The following diagram shows you this:
Square from Triangles
There is an interesting thing to note here. The square is ABDC instead of the usual ABCD. Why is that? Because of how OpenGL chains triangles together.
What you see here is a . A triangle strip is a series of connected triangles, 2 triangles in our case.
OpenGL draws the following triangle strip (which is a square) using the vertices in the following order:
Triangle 1: V1 -> V2 -> V3
Triangle 2: V3 -> V2 -> V4
Triangle Strip
It draws the first triangle using the vertices in order, then it takes the last vertex from the previous triangle and uses the last side of the triangle as the basis for the new triangle.
This also has benefits: we eliminate redundant data from the memory.
Source: www.javacodegeeks.com
More about OpenGL texture mapping example Code
Solder resist
by uoipBasically, the surface tension of the molten solder will make it cling to hot metal. It will avoid areas with solder resist. Actually, it won't stick well to PCB material even if the PCB material isn't covered in solder resist, but the solder resist is especially good at resisting heat and repelling solder.
If you use too much solder, you might accidentally create a temporary solder bridge, but that's easy enough to clean up and fix with a little bit of solder wick.
See this video. It shows soldering of fairly fine-pitch surface mount devices.
CorelDRAW X7 review: Customizable features make this robust design program .. — PCWorld
.. purchase, as well as a $25 monthly subscription. People miffed by Adobe's wholesale move to subscriptions will find a great alternative here. ..
Galaxy 61 Delivers Show Open for VH1's 'The Fabulous Life — Animation World Network
VHI recently called upon Galaxy 61 to create a show intro for the new 2014 season of The Fabulous Life, the hit series that reveals the extravagant places, possessions and pastimes of pop-culture's most famous celebrities. The Brooklyn-based ..
|
Apple Iphone 5S or Apple Iphone 5 Accessories - Premium Plastic Shell / Edge Protector Back Cover Hard Case + 1 of New Assorted Color Metal Stylus Touch Screen Pen (Red Shell / Black Edge)
Wireless (WAM Apple Iphone 5S / Iphone 5)
- Premium Hard Cover Protector Case + Metal Stylus Touch Screen Pen
- Made of High Quality Durable Plastic Material
- Perfect fit for Apple Iphone 5S / Iphone 5
- Provides Great Protection from Scratch and Scrape
- 1 of New Metal Stylus Touch Screen Pen (4 Height, Random Color- Black, Silver, Hot Pink, Green, Light Green, Red, Blue, Light Blue, Purple and Gold)
|
Hunterdon County Polytech students bridge the gap thanks to local Rotary Clubs — Hunterdon County Democrat
This year's Job Fair, on March 25, attracted the Dave Gansfuss Allstate Agent for an agency logo; G&H Publishing and author Katherine Kurz for children's book illustrations; Artiste Salon for a new logo, brochure and social media materials; St.
FAQ
