OpenGL

HACK24 : Submitted

Posted on by burf2000

2014-07-06 22.27.38

 

Finally, a month and a week late, the first version of Hack24 has been submitted.  Emotional moment, trying to write even a simple MMO single handedly is a massive task, trying to do it in a month with a family and full time job, is practically impossible.  I did it in 2 months 🙂

I will write more on it soon, enjoying a beer at the moment.

Version 1.0 supports (I wanted to call it 0.1):

Hacking, buying, entering, claiming from buildings

Scanning and Robbing players

Items allow players to teleport, scan, brute force hack, enter buildings, shield, speed up and invisibility.

I will be updating the website, and writing a how to play guide 🙂

 

 

Hack24 MMO : We have trees!

Posted on by burf2000

I had planned to do more updates but I have been trying to finish the v0.1 of the game for the end of May.  To be honest it is probably not going to happen however I am making good progress 🙂 What can you do so far?

  1. Game has 10 different types of buildings/ world objects
  2. You can see other players in the game
  3. You can buy and hack building to give you XP, Money
  4. Brought buildings you can enter and you can claim money from them
  5. HUD display shows you your buildings, free buildings and other player buildings
  6. Exploring gives you XP
  7. More XP, the higher LVL you are and the better hacker you become

2014-05-28 13.00.09   2014-05-28 12.59.16 Whats next?

  1. Scan and rob players
  2. Spawn random items for people to collect
  3. Be able to buy items
  4. Implement item properties (shield, lives, invisibility etc)
  5. Fix collision
  6. Quests / Missions
  7. BUG FIXING

Using Obj / Blender objects in iOS

Posted on by burf2000

This is a small post about getting Blender objects in to iOS using the Obj file format.

First off, below is a fantastic tutorial on how to do it.

How To Export Blender Models to OpenGL ES: Part 1/3

This tutorial shows you how to export a Obj from Blender and convert it in to header files to use directly in to your iOS source.

The issue comes when you try to make your own object (I picked a cylinder) and convert it using the OSX tool it gets you to create.  Every object I made, crashed the tool.

For it to work you need to apply UV (surface/mesh) co-ordinates.  For someone who knows very little about 3D stuff, this caught me out.

To fix

  1. Select the object and press Tab (so the Mesh menu is available)
  2. Press U
  3. Select Smart UV
  4. Press OK.

I have no idea what it does but it does allow me to export my object and convert it using the Tool created in the link above 🙂

 

 

 

 

 

GLKIT Object Picking

Posted on by burf2000

For anyone who has played with OpenGL ES, its really hard work (iOS or Android). I have spent many hours on OpenGL ES 1.0 and 2.0, making my own frameworks etc.

Apple introduced GLKit in iOS 5 if I remembered correctly and it was designed to make the maths side easier. One of the things I struggle with is object picking, this is touching the screen and turning that in to a 3D position in the OpenGL world. Generally there is 2 ways to do this, Colour picking and Ray Picking.
Colour picking is when the user touches the screen, every object is rendered as a different colour and then you detect what colour that person touched to work out where they touched.

Ray Picking, is where you fire off a ray and work out what the first object is that it hits. This requires quite a bit of maths which people have already done for you but in different programming languages.

However, the point of this article is that I discovered that Apple have added functions to help with Ray Picking namely GLKMathUnproject

Code based from this StackOverFlow post http://stackoverflow.com/questions/20214498/updating-opengl-es-touch-detection-ray-tracing-for-ipad-retina

This works out when you touch the floor (self.plane) and then puts self.cube at that position

- (BOOL)didTouchObject: (CGPoint) tapLoc
{
tapLoc.x *= [UIScreen mainScreen].scale;
tapLoc.y *= [UIScreen mainScreen].scale;

bool testResult;

GLint viewport[4];
glGetIntegerv(GL_VIEWPORT, viewport);

GLKVector3 nearPt = GLKMathUnproject(GLKVector3Make(tapLoc.x, (tapLoc.y-viewport[3])*-1, 0.0), _baseModelViewMatrix, _projectionMatrix, &viewport[0] , &testResult);
GLKVector3 farPt = GLKMathUnproject(GLKVector3Make(tapLoc.x, (tapLoc.y-viewport[3])*-1, 1.0), _baseModelViewMatrix, _projectionMatrix, &viewport[0] , &testResult);

//farPt = GLKVector3Subtract(farPt, nearPt);

float xDif = (farPt.x – nearPt.x) / 1000;
float yDif = (farPt.y – nearPt.y) / 1000;
float zDif = (farPt.z – nearPt.z) / 1000;

for (int i = 0; i < 100; i ++)
{
if ((nearPt.x + (xDif * i)) > self.plane.position.x – self.plane.scale.x && (nearPt.x + (xDif * i)) < self.plane.position.x + self.plane.scale.x &&
(nearPt.y + (yDif * i)) > self.plane.position.y – self.plane.scale.y && (nearPt.y + (yDif * i)) < self.plane.position.y + self.plane.scale.y &&
(nearPt.z + (zDif * i)) > self.plane.position.z – self.plane.scale.z && (nearPt.z + (zDif * i)) < self.plane.position.z + self.plane.scale.z)
{

NSLog(@”Hit cube”);
self.cube.position = GLKVector3Make(nearPt.x + (xDif * i), nearPt.y + (yDif * i), nearPt.z + (zDif * i));
return YES;
}

}

return NO;

}