What I will Learn here?:

​On this tutorial ​​we will see how to Optimize the data sent to Vertex Shader, in order to avoid sending off-screen vertices to the pipeline.

We will also see how to detect collisions with the terrain surface and we will also add gravity to the terrain!

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​Note:

All this new feactures and look at the speed, increased due to the use of quad tree to avoid sending vertices outside of our camera view to the GPU.

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My old computer with 4 years old with:

- Intel-Core2-Duo-Processor-E8400-(6M-Cache-3_00-GHz-1333-MHz-FSB)

- GTX 560 ti

Can do +-2000 fps overclocked at full screen 1920x1080

Try in your computer Maximize the Window then ALT ENTER ...

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​Let's check our current main source tree, except the LIBs:

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Added source on White:

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​│   Applicationclass.cpp
│   Applicationclass.h
│   counter.h
│   main.cpp
│   main.h
│
├───camera
│       cameraClass.cpp
│       cameraClass.h
│       frustumClass.cpp
│       frustumClass.h​

│       lightClass.cpp
│       lightClass.h
│       positionClass.cpp
│       positionClass.h
│
├───game
│       playerClass.cpp
│       playerClass.h​
│​

├───graphics
│       spriteClass.cpp
│       spriteClass.h​

│       textClass.cpp
│       textClass.h
│       textFontClass.cpp
│       textFontClass.h
│
├───input
│       inputClass.cpp
│       inputClass.h
│
├───loader
│       objModelV2Class.cpp
│       objModelV2Class.h
│
├───shader
│       shaderClass.cpp
│       shaderClass.h
│

├───system
│       dx11Class.cpp
│       dx11class.h
│       SystemClass.cpp
│       SystemClass.h
│       xml_loader.cpp
│       xml_loader.h​

│
└───terrain
        quadtreeClass.cpp
        quadtreeClass.h
        terrainClass.cpp
        terrainClass.h
        terrainManagerClass.cpp
        terrainManagerClass.h
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​​​(main.h) ​

- Set for Chapter 14

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​Colision Detection:

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We will use a new variable/flag that swi​tch with Key F12 between colision detection on / off

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#if TUTORIAL_CHAP >= 14
bool g_GOD_MODE = false;
#endif/

 

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    // Proccess "F12": GOD MODE SWITCH
    // --------------------------------------------------------------------------------------------
    #if TUTORIAL_CHAP >= 14
    {   static bool state = false;

        if ((m_player[g_NetID]->p_player.IsGodModePressed) && (!state)) {
            state = true;
        }
        if ((!m_player[g_NetID]->p_player.IsGodModePressed) && (state)) {
            g_GOD_MODE = !g_GOD_MODE;
            state = false;
        }
    }
    #endif

 

Also use Key "A" and "Z" to go up and down on god mode:

    if (g_GOD_MODE) {
        m_NextPosition.MoveUpward(m_player[g_NetID]->p_player.IsAPressed);   
        m_NextPosition.MoveDownward(m_player[g_NetID]->p_player.IsZPressed);
    }

 

This is the new part to detect colisions with the terrain comparing the normals (nx and nz <=0.5):​

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​    //[3] - Check Colisions:
    // --------------------------------------------------------------------------------------------
    #if TUTORIAL_CHAP >= 14
    if (!g_GOD_MODE)
        nextHeight = m_TerrainManager.m_Terrain->getTerrainHeight(m_NextPosition.m_positionX, m_NextPosition.m_positionZ);

    //Detect colision with terrain:
    float nx=1.0f, nz=1.0f;
    if (!g_GOD_MODE) {
        if ((m_NextPosition.m_positionZ < m_TerrainManager.m_Terrain->m_terrainHeight) && (m_NextPosition.m_positionX < m_TerrainManager.m_Terrain->m_terrainWidth))  {
            #if TUTORIAL_CHAP >= 14 && TUTORIAL_CHAP < 18
            nx = m_TerrainManager.m_Terrain->m_heightMap_13[(m_TerrainManager.m_Terrain->m_terrainHeight * ((int)m_NextPosition.m_positionZ)) + ((int)m_NextPosition.m_positionX)].nx;//TODO: all map types
            nz = m_TerrainManager.m_Terrain->m_heightMap_13[(m_TerrainManager.m_Terrain->m_terrainHeight * ((int)m_NextPosition.m_positionZ)) + ((int)m_NextPosition.m_positionX)].nz;
            #elif TUTORIAL_CHAP >= 18 && TUTORIAL_CHAP < 19
            // Future
            #elif TUTORIAL_CHAP >= 19 && TUTORIAL_CHAP < 21
            // Future
            #elif TUTORIAL_CHAP >= 21
            // Future
            #endif
        }
    }

    if (!g_GOD_MODE) {
        if ( abs(nz) <= 0.5f || nextHeight < m_Position[g_NetID]->m_positionY)
            #if TUTORIAL_CHAP >= 96
            if ( CompoundZnormalOK )
            #endif
                m_Position[g_NetID]->m_positionZ = m_NextPosition.m_positionZ;

        if ( abs(nx) <= 0.5f  || nextHeight < m_Position[g_NetID]->m_positionY)
            #if TUTORIAL_CHAP >= 96
            if ( CompoundXnormalOK )
            #endif
                m_Position[g_NetID]->m_positionX = m_NextPosition.m_positionX;
    } else {
        m_Position[g_NetID]->m_positionZ = m_NextPosition.m_positionZ;
        m_Position[g_NetID]->m_positionX = m_NextPosition.m_positionX;
    }

    // Update also "Y" position (Get Height at our position)
    // --------------------------------------------------------------------------------------------
    if (!g_GOD_MODE)
        height = m_TerrainManager.m_Terrain->getTerrainHeight(m_Position[g_NetID]->m_positionX, m_Position[g_NetID]->m_positionZ); // Gravity to Terrain
    else
        height = m_NextPosition.m_positionY;
    #else
    //[4] Get the new allowed positions:
    m_Position[g_NetID]->m_positionZ = m_NextPosition.m_positionZ;
    m_Position[g_NetID]->m_positionX = m_NextPosition.m_positionX;
    #endif

 

​​​​Project Code:

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http://woma.no-ip.org/woma/WoMA_PartII_Chap14.zip

 

​What's next?

On next tutorial we will see how to Render the Respective Mini-Map of this Big Map