• Advertisement
  • Popular Tags

  • Popular Now

  • Advertisement
  • Similar Content

    • By fleissi
      Hey guys!

      I'm new here and I recently started developing my own rendering engine. It's open source, based on OpenGL/DirectX and C++.
      The full source code is hosted on github:
      https://github.com/fleissna/flyEngine

      I would appreciate if people with experience in game development / engine desgin could take a look at my source code. I'm looking for honest, constructive criticism on how to improve the engine.
      I'm currently writing my master's thesis in computer science and in the recent year I've gone through all the basics about graphics programming, learned DirectX and OpenGL, read some articles on Nvidia GPU Gems, read books and integrated some of this stuff step by step into the engine.

      I know about the basics, but I feel like there is some missing link that I didn't get yet to merge all those little pieces together.

      Features I have so far:
      - Dynamic shader generation based on material properties
      - Dynamic sorting of meshes to be renderd based on shader and material
      - Rendering large amounts of static meshes
      - Hierarchical culling (detail + view frustum)
      - Limited support for dynamic (i.e. moving) meshes
      - Normal, Parallax and Relief Mapping implementations
      - Wind animations based on vertex displacement
      - A very basic integration of the Bullet physics engine
      - Procedural Grass generation
      - Some post processing effects (Depth of Field, Light Volumes, Screen Space Reflections, God Rays)
      - Caching mechanisms for textures, shaders, materials and meshes

      Features I would like to have:
      - Global illumination methods
      - Scalable physics
      - Occlusion culling
      - A nice procedural terrain generator
      - Scripting
      - Level Editing
      - Sound system
      - Optimization techniques

      Books I have so far:
      - Real-Time Rendering Third Edition
      - 3D Game Programming with DirectX 11
      - Vulkan Cookbook (not started yet)

      I hope you guys can take a look at my source code and if you're really motivated, feel free to contribute :-)
      There are some videos on youtube that demonstrate some of the features:
      Procedural grass on the GPU
      Procedural Terrain Engine
      Quadtree detail and view frustum culling

      The long term goal is to turn this into a commercial game engine. I'm aware that this is a very ambitious goal, but I'm sure it's possible if you work hard for it.

      Bye,

      Phil
    • By tj8146
      I have attached my project in a .zip file if you wish to run it for yourself.
      I am making a simple 2d top-down game and I am trying to run my code to see if my window creation is working and to see if my timer is also working with it. Every time I run it though I get errors. And when I fix those errors, more come, then the same errors keep appearing. I end up just going round in circles.  Is there anyone who could help with this? 
       
      Errors when I build my code:
      1>Renderer.cpp 1>c:\users\documents\opengl\game\game\renderer.h(15): error C2039: 'string': is not a member of 'std' 1>c:\program files (x86)\windows kits\10\include\10.0.16299.0\ucrt\stddef.h(18): note: see declaration of 'std' 1>c:\users\documents\opengl\game\game\renderer.h(15): error C2061: syntax error: identifier 'string' 1>c:\users\documents\opengl\game\game\renderer.cpp(28): error C2511: 'bool Game::Rendering::initialize(int,int,bool,std::string)': overloaded member function not found in 'Game::Rendering' 1>c:\users\documents\opengl\game\game\renderer.h(9): note: see declaration of 'Game::Rendering' 1>c:\users\documents\opengl\game\game\renderer.cpp(35): error C2597: illegal reference to non-static member 'Game::Rendering::window' 1>c:\users\documents\opengl\game\game\renderer.cpp(36): error C2597: illegal reference to non-static member 'Game::Rendering::window' 1>c:\users\documents\opengl\game\game\renderer.cpp(43): error C2597: illegal reference to non-static member 'Game::Rendering::window' 1>Done building project "Game.vcxproj" -- FAILED. ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========  
       
      Renderer.cpp
      #include <GL/glew.h> #include <GLFW/glfw3.h> #include "Renderer.h" #include "Timer.h" #include <iostream> namespace Game { GLFWwindow* window; /* Initialize the library */ Rendering::Rendering() { mClock = new Clock; } Rendering::~Rendering() { shutdown(); } bool Rendering::initialize(uint width, uint height, bool fullscreen, std::string window_title) { if (!glfwInit()) { return -1; } /* Create a windowed mode window and its OpenGL context */ window = glfwCreateWindow(640, 480, "Hello World", NULL, NULL); if (!window) { glfwTerminate(); return -1; } /* Make the window's context current */ glfwMakeContextCurrent(window); glViewport(0, 0, (GLsizei)width, (GLsizei)height); glOrtho(0, (GLsizei)width, (GLsizei)height, 0, 1, -1); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glfwSwapInterval(1); glEnable(GL_SMOOTH); glEnable(GL_DEPTH_TEST); glEnable(GL_BLEND); glDepthFunc(GL_LEQUAL); glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); glEnable(GL_TEXTURE_2D); glLoadIdentity(); return true; } bool Rendering::render() { /* Loop until the user closes the window */ if (!glfwWindowShouldClose(window)) return false; /* Render here */ mClock->reset(); glfwPollEvents(); if (mClock->step()) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glfwSwapBuffers(window); mClock->update(); } return true; } void Rendering::shutdown() { glfwDestroyWindow(window); glfwTerminate(); } GLFWwindow* Rendering::getCurrentWindow() { return window; } } Renderer.h
      #pragma once namespace Game { class Clock; class Rendering { public: Rendering(); ~Rendering(); bool initialize(uint width, uint height, bool fullscreen, std::string window_title = "Rendering window"); void shutdown(); bool render(); GLFWwindow* getCurrentWindow(); private: GLFWwindow * window; Clock* mClock; }; } Timer.cpp
      #include <GL/glew.h> #include <GLFW/glfw3.h> #include <time.h> #include "Timer.h" namespace Game { Clock::Clock() : mTicksPerSecond(50), mSkipTics(1000 / mTicksPerSecond), mMaxFrameSkip(10), mLoops(0) { mLastTick = tick(); } Clock::~Clock() { } bool Clock::step() { if (tick() > mLastTick && mLoops < mMaxFrameSkip) return true; return false; } void Clock::reset() { mLoops = 0; } void Clock::update() { mLastTick += mSkipTics; mLoops++; } clock_t Clock::tick() { return clock(); } } TImer.h
      #pragma once #include "Common.h" namespace Game { class Clock { public: Clock(); ~Clock(); void update(); bool step(); void reset(); clock_t tick(); private: uint mTicksPerSecond; ufloat mSkipTics; uint mMaxFrameSkip; uint mLoops; uint mLastTick; }; } Common.h
      #pragma once #include <cstdio> #include <cstdlib> #include <ctime> #include <cstring> #include <cmath> #include <iostream> namespace Game { typedef unsigned char uchar; typedef unsigned short ushort; typedef unsigned int uint; typedef unsigned long ulong; typedef float ufloat; }  
      Game.zip
    • By lxjk
      Hi guys,
      There are many ways to do light culling in tile-based shading. I've been playing with this idea for a while, and just want to throw it out there.
      Because tile frustums are general small compared to light radius, I tried using cone test to reduce false positives introduced by commonly used sphere-frustum test.
      On top of that, I use distance to camera rather than depth for near/far test (aka. sliced by spheres).
      This method can be naturally extended to clustered light culling as well.
      The following image shows the general ideas

       
      Performance-wise I get around 15% improvement over sphere-frustum test. You can also see how a single light performs as the following: from left to right (1) standard rendering of a point light; then tiles passed the test of (2) sphere-frustum test; (3) cone test; (4) spherical-sliced cone test
       

       
      I put the details in my blog post (https://lxjk.github.io/2018/03/25/Improve-Tile-based-Light-Culling-with-Spherical-sliced-Cone.html), GLSL source code included!
       
      Eric
    • By Fadey Duh
      Good evening everyone!

      I was wondering if there is something equivalent of  GL_NV_blend_equation_advanced for AMD?
      Basically I'm trying to find more compatible version of it.

      Thank you!
    • By Jens Eckervogt
      Hello guys, 
       
      Please tell me! 
      How do I know? Why does wavefront not show for me?
      I already checked I have non errors yet.
      using OpenTK; using System.Collections.Generic; using System.IO; using System.Text; namespace Tutorial_08.net.sourceskyboxer { public class WaveFrontLoader { private static List<Vector3> inPositions; private static List<Vector2> inTexcoords; private static List<Vector3> inNormals; private static List<float> positions; private static List<float> texcoords; private static List<int> indices; public static RawModel LoadObjModel(string filename, Loader loader) { inPositions = new List<Vector3>(); inTexcoords = new List<Vector2>(); inNormals = new List<Vector3>(); positions = new List<float>(); texcoords = new List<float>(); indices = new List<int>(); int nextIdx = 0; using (var reader = new StreamReader(File.Open("Contents/" + filename + ".obj", FileMode.Open), Encoding.UTF8)) { string line = reader.ReadLine(); int i = reader.Read(); while (true) { string[] currentLine = line.Split(); if (currentLine[0] == "v") { Vector3 pos = new Vector3(float.Parse(currentLine[1]), float.Parse(currentLine[2]), float.Parse(currentLine[3])); inPositions.Add(pos); if (currentLine[1] == "t") { Vector2 tex = new Vector2(float.Parse(currentLine[1]), float.Parse(currentLine[2])); inTexcoords.Add(tex); } if (currentLine[1] == "n") { Vector3 nom = new Vector3(float.Parse(currentLine[1]), float.Parse(currentLine[2]), float.Parse(currentLine[3])); inNormals.Add(nom); } } if (currentLine[0] == "f") { Vector3 pos = inPositions[0]; positions.Add(pos.X); positions.Add(pos.Y); positions.Add(pos.Z); Vector2 tc = inTexcoords[0]; texcoords.Add(tc.X); texcoords.Add(tc.Y); indices.Add(nextIdx); ++nextIdx; } reader.Close(); return loader.loadToVAO(positions.ToArray(), texcoords.ToArray(), indices.ToArray()); } } } } } And It have tried other method but it can't show for me.  I am mad now. Because any OpenTK developers won't help me.
      Please help me how do I fix.

      And my download (mega.nz) should it is original but I tried no success...
      - Add blend source and png file here I have tried tried,.....  
       
      PS: Why is our community not active? I wait very longer. Stop to lie me!
      Thanks !
  • Advertisement
  • Advertisement
Sign in to follow this  

OpenGL 4x4 matrix and 3x3 matrix

This topic is 2969 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

Hy. I must convert a 4x4 matrix from collada to a 3x3 matrix in opengl , is correct to do:
1   2   3   4
5   6   7   8
9   10  11  12
13  14  15  16

Collada: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 OpenGL: 1 5 9 13 2 6 10 14 3 7 11 15 4 8 12 16 ignore the 4 ,8,12 and 16 and thake the last row 13 14 15 for the translate component? Thanks.

Share this post


Link to post
Share on other sites
Advertisement
I do this function:
for collada importer:

void CColladaReaderTriangles::GetMatrixComponent(domNode* dn ,Transformation* trans)
{
domMatrix_Array pMatrix = dn->getMatrix_array();
const unsigned int nMxCount = (unsigned int)pMatrix.getCount();
float* pfVect = new float[16];
for(unsigned int iMx = 0; iMx< nMxCount; iMx ++)
{

domFloat4x4* pV = &pMatrix.get(iMx)->getValue();

pfVect[0]=((float)pV->get(0));
pfVect[1]=((float)pV->get(1));
pfVect[2]=((float)pV->get(2));
pfVect[3]=((float)pV->get(3));

pfVect[4]=((float)pV->get(4));
pfVect[5]=((float)pV->get(5));
pfVect[6]=((float)pV->get(6));
pfVect[7]=((float)pV->get(7));

pfVect[8]=((float)pV->get(8));
pfVect[9]=((float)pV->get(9));
pfVect[10]=((float)pV->get(10));
pfVect[11]=((float)pV->get(11));

pfVect[12]=((float)pV->get(12));
pfVect[13]=((float)pV->get(13));
pfVect[14]=((float)pV->get(14));
pfVect[15]=((float)pV->get(15));

}

//create 3x3 column major
Matrix3f matrixRot(pfVect[0], pfVect[4], pfVect[8], pfVect[1], pfVect[5], pfVect[9], pfVect[2], pfVect[6], pfVect[10]);
Vector3f translation(pfVect[3], pfVect[7], pfVect[11]);

.
.
.ecc...
}




the translation work fine, but the rotation is flipped,may be that is relative to collada exporter 3dsmax that export in Z_UP or Y_UP?or there are other errors?
thanks

Share this post


Link to post
Share on other sites
IIRC, Collada uses column vectors in row major order with the homogeneous co-ordinate stored as 4th element. OpenGL, on the other hand, uses column vectors in column major order with the homogeneous co-ordinate stored as 4th element.

Using the matrix indexing shown in the OP, then
Quote:
Collada: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
OpenGL: 1 5 9 13 2 6 10 14 3 7 11 15 4 8 12 16
would be correct. However, notice please indexes in programming language run commonly from 0, so make sure to have that right in your implementation.

Using the matrix indexing shown in the OP once again, then the translation would be in the elements { 4, 8, 12 } (which is mapped to { 13, 14, 15 } for OpenGL, and { 12, 13, 14 } for OpenGL when starting with index 0!).

From this point of view the implementation shown in the 2nd post seems me correct.

Share this post


Link to post
Share on other sites
Thanks.
so , may be that the axis x,y and z in 3ds and in opengl are swapped?
If the problem is this, how i can repair?
3ds have


Z
|
|
/\ / \x y
How are the opengl axis?

Thanks.

Share this post


Link to post
Share on other sites
sorry , but i can't draw the axis ,positive X to the right, positive Y into the distance, and positive Z up)

Share this post


Link to post
Share on other sites
If I interpret your ASCII art correctly, then you say that 3DS has its z axis upwards, its x axis to the right, and its y axis forwards (i.e. into the distance). So it has a right-handed co-ordinate system as OpenGL has, but it is rotated by -90° about the x axis, because OpenGL has its y axis upwards and its z axis towards. (All this said w.r.t. the standard camera orientation.) Right so far?

If so, then you have to apply an additional rotation about the x axis with 90°, of course. This makes a matrix like this
[ 1  0  0  0 ]
[ 0 0 1 0 ]
[ 0 -1 0 0 ]
[ 0 0 0 1 ]
if I made no error ;) IMHO you should apply this matrix during import directly on the vertices.


EDIT:
Quote:
Original post by giugio
sorry , but i can't draw the axis ,positive X to the right, positive Y into the distance, and positive Z up)
Err, was this little post already there when I formulated the above answer? (rolleyes) Sorry, but I've managed it to overlook that hint. Tststs.



[Edited by - haegarr on March 8, 2010 1:56:08 AM]

Share this post


Link to post
Share on other sites
Sign in to follow this  

  • Advertisement