What do you need help with? V. 3.0

[LouisD]

Metahelp problem. I've seen it spelt two ways, is the shortened plural of polygons:

Polys? or Polies?

Also can anyone point me towards a transform method/matrix for a kind of 4 point skew, so say I want to squash a square image into one that encompasses 2 points (think image perspective correction)

[NorthernGate]

Kay, having just started working with shaders and the lighting implementation, I'm having a little trouble understanding how to implement cone lighting, I've been trying for the past two days, so I must be missing something really obvious.

Here is my current cone light PS:

PixelToFrame Output = (PixelToFrame)0;

	float4 ColorMap = tex2D(ColorMapSampler, PSIn.TexCoord);
	float3 NormalMap = (2.0f * (tex2D(NormalMapSampler, PSIn.TexCoord))) - 1.0f;

	float3 Pixel;
		Pixel.x = ScreenWidth * PSIn.TexCoord.x;
		Pixel.y = ScreenHeight * PSIn.TexCoord.y;
		Pixel.z = 0;

	float3 LightDirection = LightPosition - Pixel;
	float3 LightNormal = normalize(LightDirection);

	float Amount = max(dot(NormalMap, LightNormal), 0);
	float Attenuation = saturate(1.0f - length(LightDirection) / LightDecay);

	float3 Reflection = normalize(2 * Amount * NormalMap - LightNormal);
	float Specular = min(pow(saturate(dot(Reflection, float3(0, 0, 1))), 10), Amount);

	float ConeLight = dot(ConeAngle, -LightDirection);

	if(ConeLight > ConeSize)
	{
		float ConeIntensity = pow(ConeLight, 0);
		Attenuation *= ConeIntensity;
		Output.Color = ColorMap * Attenuation * LightColor * LightStrength + (Specular * Attenuation * SpecularStrength);
	}

	return Output;

which always produces something similar to this:

[img]http://img857.imageshack.us/img857/6123/screenshot2011061808021.png[/img]

My main problem right now is just getting the cone to shrink from it's stubborn 180 size. Any assistance would be lovely.

[Nigey Nige]

[QUOTE=Wyzard;30516225]Read about the [url=http://www.w3.org/TR/html4/interact/forms.html#h-17.13.4]form content types[/url]; you should use multipart/form-data, not application/x-www-form-urlencoded. And put the form data in the body of your POST, not in the URL. Servers impose length limits on URLs, so putting the entire contents of a file into a URL is a bad idea.[/QUOTE]

I don't quite understand how to differentiate between the URL and the body of my POST, or also how to separate the URL-encoded parameters like:

data = URLEncoder.encode("email", enc) + "=" + URLEncoder.encode(Main.getEmail(), enc);
data += "&" + URLEncoder.encode("password", enc) + "=" + URLEncoder.encode(Main.getPassword(), enc);

from the multipart/form-data encoded file:

data += "&" + URLEncoder.encode("data", "enc") + "=" + URLEncoder.encode(codec.encode(bytes).toString(), enc);
//Here the file has been converted to a byte array, then to binary using the Apache BinaryCodec, then to a String. 
//wtf i don't even know what i'm doing

[editline]lolwat[/editline]

[url=http://pastebin.com/SUycckTZ]Here's the code if anyone wants to see.[/url]

[esalaka]

[QUOTE=Nigey Nige;30544641]I don't quite understand how to differentiate between the URL and the body of my POST[/QUOTE]

You know how GET puts the parametres in the URL?

Well, POST sends them separately.
Just... Look up HTTP documentation somewhere.

[Wyzard]

Install Wireshark and have it capture traffic while you upload a file to a website somewhere. Looking at some valid HTTP traffic will probably help more than just reading specs.

[foszor]

Anyone know how to fix the perceptive so it doesn't stretch the geometry at the edges of the screen?

Example, cubes look strange on the right:

[img]http://gyazo.com/dc763ab4a0522c38af7149fd600e09fd.png[/img]

[Lord Ned]

I'm assuming you're not using anything like XNA, but I think what you're creating is a Perspective view matrix, when you want an Orthographic.

You can do it in XNA by Matrix.CreateOrthographic.

[foszor]

I still want it to have some depth though, wont Orthographic take away all perspective?

[Lord Ned]

Probably. Beyond that I'm afraid I'm no help :(

[Wyzard]

[QUOTE=foszor;30550946]Anyone know how to fix the perceptive so it doesn't stretch the geometry at the edges of the screen?[/QUOTE]
If you want to reduce the perspective effect, move the camera back and narrow its field of view. Read about [url=http://en.wikipedia.org/wiki/Dolly_zoom]dolly zoom[/url] to understand why.

(If you dolly-zoomed the camera back to an infinite distance, that'd be an orthographic view.)

[weltensturm]

Play around with the FoV until you find something you like.

[ief014]

Something confusing that I just can't figure out and I'm probably going to feel stupid once I get this working.

/***********************************************************/
/************************* State.h *************************/
/***********************************************************/

#ifndef __SYS_STATE_H__
#define __SYS_STATE_H__

#include <vector>

#include <sys/Component.h>

namespace sys
{
	
	class State
	{
	public:
		State(void);
		~State(void);

		bool AllowExclusiveDrawing; //false will not call draw on objects outside of bounds

		virtual void Initialized();
		virtual void Exit();
		virtual void Tick(float dt);
		virtual void Draw();

		virtual void OnMouseMove(int x, int y);
		virtual void OnMouseDown(int x, int y, unsigned int button);
		virtual void OnMouseUp(int x, int y, unsigned int button);
		virtual void OnMouseWheel(int x, int y, int d);
		virtual void OnKeyPress(char key);
		virtual void OnKeyUnpress(char key);

		inline bool IsFocused(const Component &c);

	protected:
		std::vector<Component*> Components;

	private:
		Component* focusedComponent_;
	};

}

#endif // __SYS_STATE_H__

/***********************************************************/
/*********************** Component.h ***********************/
/***********************************************************/

#ifndef __SYS_COMPONENT_H__
#define __SYS_COMPONENT_H__

#include "Point.h"
#include "State.h"

namespace sys
{	
	
	class Component  
	{
	public:
		Component(State* s);
		~Component();

		Point Position;
		Point Size;
		bool Locked;
		bool Visible;

		virtual void Tick(float dt);
		virtual void Draw();

		virtual void OnMouseHover(int localx, int localy);
		virtual void OnMouseMoved(int localx, int localy);
		virtual void OnMouseMovedInside(int localx, int localy);
		virtual void OnMouseDown(int x, int y, unsigned int button);
		virtual void OnMouseUp(int x, int y, unsigned int button);
		virtual void OnMouseClick(int localx, int localy, unsigned int button);
		virtual void OnMouseUnclick(int localx, int localy, unsigned int button);
		virtual void OnMouseWheel(int localx, int localy, unsigned int button);
		virtual void OnKeyPress(char key);
		virtual void OnKeyUnpress(char key);

	private:
		State* parent_;
		
	};
}

#endif // __SYS_COMPONENT_H__

/***********************************************************/
/********************** Component.cpp **********************/
/***********************************************************/

#include "Point.h"
#include "State.h"

#include "Component.h"

using namespace sys;

Component::Component(State* s)
:
parent_(s),
Position(Point(0,0)),
Size(Point(0,0))
{
}

Component::~Component()
{
}

/* 
	Removed bunch of empty voids from header for this paste
*/

Errors I'm getting: (I'm certain it has something to do with the two headers including eachother)

Output

 Compiling...
Engine.cpp
c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\component.h(13) : error C2061: syntax error : identifier 'State'
c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\component.h(36) : error C2143: syntax error : missing ';' before '*'
c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\component.h(36) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\component.h(36) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
main.cpp
c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\component.h(13) : error C2061: syntax error : identifier 'State'
c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\component.h(36) : error C2143: syntax error : missing ';' before '*'
c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\component.h(36) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\component.h(36) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
State.cpp
c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\component.h(13) : error C2061: syntax error : identifier 'State'
c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\component.h(36) : error C2143: syntax error : missing ';' before '*'
c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\component.h(36) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\component.h(36) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\state.cpp(31) : warning C4018: '<' : signed/unsigned mismatch
c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\state.cpp(49) : warning C4018: '<' : signed/unsigned mismatch
c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\state.cpp(59) : warning C4018: '<' : signed/unsigned mismatch
Component.cpp
c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\component.h(13) : error C2061: syntax error : identifier 'State'
c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\component.h(36) : error C2143: syntax error : missing ';' before '*'
c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\component.h(36) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\component.h(36) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\component.cpp(9) : error C2511: 'sys::Component::Component(sys::State *)' : overloaded member function not found in 'sys::Component'
        c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\component.h(11) : see declaration of 'sys::Component'
c:\users\ief015\documents\visual studio 2008\projects\mitosis\mitosis\sys\component.cpp(67) : fatal error C1004: unexpected end-of-file found
Generating Code...

Results
Build log was saved at "file://c:\Users\ief015\Documents\Visual Studio 2008\Projects\mitosis\mitosis\Debug\BuildLog.htm"
mitosis - 18 error(s), 3 warning(s)

help most appreciated :buddy:

[Wyzard]

You have circular includes: State.h includes Component.h, and Component.h includes State.h. The #include "State.h" in Component.h does nothing because __SYS_STATE_H__ is already defined, because line 5 in State.h is the reason why Component.h is being read in the first place.

[ief014]

[QUOTE=Wyzard;30554363]You have circular includes: State.h includes Component.h, and Component.h includes State.h. The #include "State.h" in Component.h does nothing because __SYS_STATE_H__ is already defined, because line 5 in State.h is the reason why Component.h is being read in the first place.[/QUOTE]

Ugh, I knew it was something like that. I've been on a programming hiatus for a couple months and I'm trying to get back at it. ;D Thanks

[editline]18th June 2011[/editline]

[QUOTE=Wyzard;30554363]You have circular includes: State.h includes Component.h, and Component.h includes State.h. The #include "State.h" in Component.h does nothing because __SYS_STATE_H__ is already defined, because line 5 in State.h is the reason why Component.h is being read in the first place.[/QUOTE]

Interesting

I have removed [b]Component(State* s);[/b] in Component.cpp and replaced it with a blank constructor and modified the .cpp as necessary, and the same with [b]State* parent_;[/b] and now it seems to be compiling without errors.

This is basically what I'm trying to do [url]http://pastebin.com/7qNJw6Rt[/url]

[foszor]

Messing with the FoV and distance seemed to help the most. Its not perfect but its a lot better.

[ief014]

Oh god :doh:, I just realised I could define the other class as "class State;" in Components.h and "class Component;" in State.h

Woohoo!

[Wingar]

Hey guys, I've been working on a small game in XNA and I want to use XML files for config, you know, screen res, fullscreen. shit like that.
So I want it to read then use what it's read to control the engine size. Right now it's basically this.

        public void Read()
        {
            XmlTextReader textReader = new XmlTextReader("%USERPROFILE%\\Saved Games\\Saturn\\settings.config");
            textReader.Read();
        }

        public void Size()
        {
            graphics.PreferredBackBufferWidth = 800;
            graphics.PreferredBackBufferHeight = 600;
            graphics.IsFullScreen = false;
            graphics.ApplyChanges();
        }

How would I get the reader to change the resolution?

[SourBree]

I made a thread about this but I might as well also ask here. Does anyone know of any useful tutorials or of any open source program written in Python 3 with Pygame (it must be 3) that deal with map making? I mean just simple 2D map making btw. I want to have something to base my map maker off of so I don't start coding it super horribly. I'm just trying to make a simple platformer.

[mutated]

[QUOTE=foszor;30555401]Messing with the FoV and distance seemed to help the most. Its not perfect but its a lot better.[/QUOTE]

Taking an easy example like Minecraft - resize the window to an extremely wide window and you get stretching like this, that really can't be avoided.

Normal shot of a house:
[quote][img]http://dl.dropbox.com/u/19978518/Minecraft%20pictures/Other/2011-06-19_00.52.01.png[/img][/quote]

I moved forward a bit to get a better example of stretching, but here you go:
[quote][img_thumb]http://dl.dropbox.com/u/19978518/Minecraft%20pictures/Other/2011-06-19_00.52.27.png[/img_thumb][/quote]

check out that fuggin' torch

[ZeekyHBomb]

[url]http://strlen.com/gfxengine/fisheyequake/compare.html[/url]

[Nigey Nige]

[QUOTE=esalaka;30545104]You know how GET puts the parametres in the URL?

Well, POST sends them separately.
Just... Look up HTTP documentation somewhere.[/QUOTE]

[QUOTE=Wyzard;30545613]Install Wireshark and have it capture traffic while you upload a file to a website somewhere. Looking at some valid HTTP traffic will probably help more than just reading specs.[/QUOTE]

So I did both of these, but everything I know about programming is in Java, and I can't figure out how all this information translates. I don't know the syntax for all the stuff that's being explained, and nowhere seems to have the info in a format I can understand. All I want to do is make an app that uploads images to tumblr! :smith:

[editline]adf[/editline]

[img]http://i.imgur.com/7mSWQ.png[/img]

I'm just gonna go bang my head against a wall for a while.

[RyanDv3]

[QUOTE=Staneh;30525330]Right. I am using a Timer, to increase an int value, which determines the rotation of my rectangle, the code for that:
[cpp] rectrotation = new Timer(100, new RectRotationHandler());

class RectRotationHandler implements ActionListener{
public void actionPerformed(ActionEvent e){
rotation += 5;
}
}

[/cpp]

Now, for the drawing, I use a BufferedImage, like this:

[cpp] public void drawRectangle(){
Graphics2D b = buffer.createGraphics();
if(b instanceof Graphics2D){
b.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
b.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
}
int rectx = 80;
int recty = 80;
b.rotate(rotation * Math.PI / 180);
b.setColor(Color.RED);
b.drawRect(rectx,recty,40,40);
}[/cpp]

The rectangle is drawn with a simple drawRect(), and the rotation is done by doing b.rotate(), with as parameter the rotation int, which is being increased by the timer, so it rotates automatically. Now, I need to mess with the b.translate, so it doesn't rotate around the 0,0 axis of my level, but I have no idea how.

[editline]17th June 2011[/editline]

Look at post #506[/QUOTE]

You are drawing your rectangle with an offset: don't do that.

Instead, b.translate() to rectx and recty, b.rotate(), and then b.drawRect(-20, -20, 20, 20).

This is of course assuming whatever library you are using works how I think it works...

[Bambo.]

Can anyone help me with SFML and OpenGL? for some reason even the example opengl doesn't work

////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include <SFML/Window.hpp>


////////////////////////////////////////////////////////////
/// Entry point of application
///
/// \return Application exit code
///
////////////////////////////////////////////////////////////
int main()
{
    // Create the main window
    sf::Window App(sf::VideoMode(800, 600, 32), "SFML OpenGL");

    // Create a clock for measuring time elapsed
    sf::Clock Clock;

    // Set color and depth clear value
    glClearDepth(1.f);
    glClearColor(0.f, 0.f, 0.f, 0.f);

    // Enable Z-buffer read and write
    glEnable(GL_DEPTH_TEST);
    glDepthMask(GL_TRUE);

    // Setup a perspective projection
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(90.f, 1.f, 1.f, 500.f);

    // Start game loop
    while (App.IsOpened())
    {
        // Process events
        sf::Event Event;
        while (App.GetEvent(Event))
        {
            // Close window : exit
            if (Event.Type == sf::Event::Closed)
                App.Close();

            // Escape key : exit
            if ((Event.Type == sf::Event::KeyPressed) && (Event.Key.Code == sf::Key::Escape))
                App.Close();

            // Resize event : adjust viewport
            if (Event.Type == sf::Event::Resized)
                glViewport(0, 0, Event.Size.Width, Event.Size.Height);
        }

        // Set the active window before using OpenGL commands
        // It's useless here because active window is always the same,
        // but don't forget it if you use multiple windows or controls
        App.SetActive();

        // Clear color and depth buffer
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        // Apply some transformations
        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();
        glTranslatef(0.f, 0.f, -200.f);
        glRotatef(Clock.GetElapsedTime() * 50, 1.f, 0.f, 0.f);
        glRotatef(Clock.GetElapsedTime() * 30, 0.f, 1.f, 0.f);
        glRotatef(Clock.GetElapsedTime() * 90, 0.f, 0.f, 1.f);

        // Draw a cube
        glBegin(GL_QUADS);

            glVertex3f(-50.f, -50.f, -50.f);
            glVertex3f(-50.f,  50.f, -50.f);
            glVertex3f( 50.f,  50.f, -50.f);
            glVertex3f( 50.f, -50.f, -50.f);

            glVertex3f(-50.f, -50.f, 50.f);
            glVertex3f(-50.f,  50.f, 50.f);
            glVertex3f( 50.f,  50.f, 50.f);
            glVertex3f( 50.f, -50.f, 50.f);

            glVertex3f(-50.f, -50.f, -50.f);
            glVertex3f(-50.f,  50.f, -50.f);
            glVertex3f(-50.f,  50.f,  50.f);
            glVertex3f(-50.f, -50.f,  50.f);

            glVertex3f(50.f, -50.f, -50.f);
            glVertex3f(50.f,  50.f, -50.f);
            glVertex3f(50.f,  50.f,  50.f);
            glVertex3f(50.f, -50.f,  50.f);

            glVertex3f(-50.f, -50.f,  50.f);
            glVertex3f(-50.f, -50.f, -50.f);
            glVertex3f( 50.f, -50.f, -50.f);
            glVertex3f( 50.f, -50.f,  50.f);

            glVertex3f(-50.f, 50.f,  50.f);
            glVertex3f(-50.f, 50.f, -50.f);
            glVertex3f( 50.f, 50.f, -50.f);
            glVertex3f( 50.f, 50.f,  50.f);

        glEnd();

        // Finally, display rendered frame on screen
        App.Display();
    }

    return EXIT_SUCCESS;
}

Apparently

 gluPerspective(90.f, 1.f, 1.f, 500.f); 

is giving the error...

1>------ Build started: Project: SFML-TEST, Configuration: Debug Win32 ------
1>  main.cpp
1>main.obj : error LNK2001: unresolved external symbol _gluPerspective@32
1>C:\Users\Bamford\documents\visual studio 2010\Projects\SFML-TEST\Debug\SFML-TEST.exe : fatal error LNK1120: 1 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

[jA_cOp]

[QUOTE=Bambo.;30563098]Can anyone help me with SFML and OpenGL? for some reason even the example opengl doesn't work[/QUOTE]

Make sure you link with glu32.lib.

[Bambo.]

[QUOTE=jA_cOp;30563120]Make sure you link with glu32.lib.[/QUOTE]

Ah ok, i'll give that a shot.

It doesn't say anything about that in the tutorials, i dont think?

[editline]19th June 2011[/editline]

Ah fantastic, it works!

Thanks alot.

[backwardspy]

I guess it assumes you already know something on how to use OpenGL with your compiler, so I doesn't bother tell you which libraries to link to and so on.

[jA_cOp]

[QUOTE=Bambo.;30563148]It doesn't say anything about that in the tutorials, i dont think?[/QUOTE]

The answer depends entirely on your programming environment, which the error message you posted gave away. And as Chris220 said, it's probably not in the scope of the tutorial anyway.

[T3hGamerDK]

I've been working on a simple game engine project for a few of my friends to use, and even though I'm not very experienced with much programming at all in C++, and it's QUITE a big step, it's something I'm all up for.
BUT, I've run into a dead end. I can't for the love of all that is sacred figure out how to use lua 5.1 to, when embedded, load a script, and then execute only a function from that script. How is it possible?

[b]tl;rd[/b]
Call lua function from c++ code

function bleh()
    print( "dicks" )
end

How do I call bleh() from a C++ program?

[jA_cOp]

[QUOTE=T3hGamerDK;30569523]I've been working on a simple game engine project for a few of my friends to use, and even though I'm not very experienced with much programming at all in C++, and it's QUITE a big step, it's something I'm all up for.
BUT, I've run into a dead end. I can't for the love of all that is sacred figure out how to use lua 5.1 to, when embedded, load a script, and then execute only a function from that script. How is it possible?

[b]tl;rd[/b]
Call lua function from c++ code

function bleh()
    print( "dicks" )
end

How do I call bleh() from a C++ program?[/QUOTE]

[cpp]
#include <iostream>
#include <lua.hpp>

int main()
{
lua_State* L = luaL_newstate();
luaL_openlibs(L); // for the print function

if(luaL_dofile(L, "myscript.lua") != 0)
{
std::cerr << lua_tostring(L, -1) << std::endl;
return 1;
}

lua_getglobal(L, "bleh");
lua_call(L, 0, 0);
}
[/cpp]

[T3hGamerDK]

[QUOTE=jA_cOp;30569681][cpp]
#include <iostream>
#include <lua.hpp>

int main()
{
lua_State* L = luaL_newstate();
luaL_openlibs(L); // for the print function

if(luaL_dofile(L, "myscript.lua") != 0)
{
std::cerr << lua_tostring(L, -1) << std::endl;
return 1;
}

lua_getglobal(L, "bleh");
lua_call(L, 0, 0);
}
[/cpp][/QUOTE]

I just tried the above code, but the value seems to be nil for some reason.
(Reason: PANIC: unprotected error in call to Lua API (attempt to call a nil value))
And nothing happens when doing a pcall instead of call.
It may be worth noting the following though, as I forgot to mention them earlier:
I've already done a lua_pcall on the script, to run some whatever is NOT a function.
Do I need to somehow "empty" the lua state and reload the script and THEN load the functions, or should I be able to do it straight forward? To help you with this, I'll link to my code (the important part) below.
main.cpp: [url]http://codepaste.net/o4qji4[/url]
log.lua [url]http://codepaste.net/gaf8dr[/url]