Terrain rendering bug

[Slastraf]

Hi,

I create my terrain using just code, following the documentation's example (c++).
However I get visual bugs, when I travel close, I get a black hole (seems like LOD breaks at some point).
Secondarily, the material shader seems to have broken.

I think it is enough to reproduce it by jus trunning this code .https://www.leadwerks.com/learn/CreateTerrain?lang=cpp

Also, take a look at the screenshot where a 2k texture should be rendered, only a very low res texture is rendered.


This is how the terrian looks like without height and just one material with a texture:
 

The code I used for the second screenshot:

 

auto world = GetEntity()->GetWorld();

if (!world)
    return;

constexpr int terrainResolution = 512;
constexpr float terrainWorldSize = 4096;
constexpr float terrainHeightMeters = 90.0f;

terrain = CreateTerrain(
    world,
    terrainResolution,
    terrainResolution,
    terrainResolution
);

terrain->SetScale(
    terrainWorldSize / static_cast<float>(terrainResolution - 1),
    terrainHeightMeters,
    terrainWorldSize / static_cast<float>(terrainResolution - 1)
);

auto ground = CreateMaterial();

auto diffuseMap = LoadTexture(
    "https://raw.githubusercontent.com/Leadwerks/Documentation/master/"
    "Assets/Materials/Ground/river_small_rocks_diff_2k.dds"
);

auto normalMap = LoadTexture(
    "https://raw.githubusercontent.com/Leadwerks/Documentation/master/"
    "Assets/Materials/Ground/river_small_rocks_nor_gl_2k.dds"
);

ground->SetTexture(diffuseMap, TEXTURE_BASE);
ground->SetTexture(normalMap, TEXTURE_NORMAL);

terrain->SetMaterial(ground);

I

I could not reproduce this bug by using the Leadwerks editor, where it looks fine.
The code I mostly copied is from the documentation : https://www.leadwerks.com/learn/CreateTerrain?lang=cpp
 

[Josh]

When you call CreateTerrain I would leave the fourth parameter undefined to let the engine choose a size:

terrain = CreateTerrain(
    world,
    terrainResolution,
    terrainResolution
);

For a 512x512 terrain it will default to 64.

You can adjust the terrain clipmap size per-camera, and the terrain base map size to increase the resolution:

camera->SetTerrainClipmaps(2048, 16.0f, 4);
terrain->SetBasemapSize(4096);

When I run the code below, based on your partial sample above, this is what I see:

Here is the code. Please run this and tell me if you see a problem, and what GPU you have:

#include "Leadwerks.h"
#include "ComponentSystem.h"

using namespace Leadwerks;

int main(int argc, const char* argv[])
{
    //Get the display list
    auto displays = GetDisplays();

    //Create a window
    auto window = CreateWindow("Leadwerks", 0, 0, 1280, 720, displays[0], WINDOW_CENTER | WINDOW_TITLEBAR);

    //Create a world
    auto world = CreateWorld();
    world->SetAmbientLight(0);

    //Create a framebuffer
    auto framebuffer = CreateFramebuffer(window);

    //Create a camera
    auto camera = CreateCamera(world);
    camera->SetFov(70);
    camera->SetPosition(0, 50, 0);
    camera->SetRotation(45, 0, 0);
    camera->SetClearColor(0.125);

    //Sunlight
    auto light = CreateDirectionalLight(world);
    light->SetRotation(45, 35, 0);
    light->SetColor(2);

    constexpr int terrainResolution = 512;
    constexpr float terrainWorldSize = 4096;
    constexpr float terrainHeightMeters = 90.0f;

    auto terrain = CreateTerrain(
        world,
        terrainResolution,
        terrainResolution
    );

    terrain->SetScale(
        terrainWorldSize / static_cast<float>(terrainResolution - 1),
        terrainHeightMeters,
        terrainWorldSize / static_cast<float>(terrainResolution - 1)
    );

    auto ground = CreateMaterial();

    auto diffuseMap = LoadTexture(
        "https://raw.githubusercontent.com/Leadwerks/Documentation/master/"
        "Assets/Materials/Ground/river_small_rocks_diff_2k.dds"
    );

    auto normalMap = LoadTexture(
        "https://raw.githubusercontent.com/Leadwerks/Documentation/master/"
        "Assets/Materials/Ground/river_small_rocks_nor_gl_2k.dds"
    );

    ground->SetTexture(diffuseMap, TEXTURE_BASE);
    ground->SetTexture(normalMap, TEXTURE_NORMAL);

    terrain->SetMaterial(ground);

    // Increase terrain texture resolution
    camera->SetTerrainClipmaps(2048, 16.0f, 4);
    terrain->SetBasemapSize(4096);

    //Camera controls
    camera->AddComponent<CameraControls>();

    //Main loop
    while (window->Closed() == false and window->KeyDown(KEY_ESCAPE) == false)
    {
        world->Update();
        world->Render(framebuffer);
    }
    return 0;
}

 

[Slastraf]

Thank you, that fixed the materials issue.

[Slastraf]

camera->SetTerrainClipmaps()

is not inside the Documentation. When I use different values I get very different results. See below.

    camera->SetTerrainClipmaps(740, 16.0f, 4);

I only get a normal looking result if I reduce the resolution to 740p.
If I keep it as you suggested, I only get one texture:

terrain->SetBasemapSize(4096);
camera->SetTerrainClipmaps(2048, 16.0f, 4);

Regardless of terrain basemap size, this happens.