Terrain lag

[Alienhead]

I can create a new scene with 2 cubes on it, one cube as a large floor and another cube as a player.  I get about 1100fps.

If I create a new scene with a 512x512 terrain on it, no textures. just a flat terrain and a cube for the player i get about 118fps..

Something aint right !

[beo6]

Can you maybe confirm if FPS only drop if Tesselation and Terrain shadows are enabled?

See also my bug report here:

 

[Alienhead]

I have tess turned off plus I dont even have a texture on the terrain.  

[StOneDOes]

Have you got a navmesh with debugging turned on? I noticed that gives quite a hit to your performance.

[Alienhead]

""If I create a new scene with a 512x512 terrain on it, no textures. just a flat terrain and a cube for the player.""

Im starting to wonder if it could be the shafting AMD drivers release... but I doubt it.

 

[beo6]

I have an NVIDIA 3090 GPU,  So if it's the same, its not about the driver. And I also don't have any navmesh

[Josh]

Here's a simple test that will produce roughly the same results.

terrtest.zip

A 512x512 terrain will result in about 263,169 polys being drawn (without LODs) so it's not nothing, and I would expect it to maybe be a bit more expensive than a model since a texture lookup is being performed in the vertex shader, and the fragment shader is more expensive than standard PBR shaders...but it may still be beneficial to take a closer look and determine exactly what the bottleneck is in this situation.

[Josh]

I am testing this in code and the results seem well within what I would consider to be normal.

• GPU: AMD 6600
• No terrain: 4200 FPS
• With terrain: 2700 FPS

#include "UltraEngine.h"
#include "ComponentSystem.h"

using namespace UltraEngine;

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

    //Create a window
    auto window = CreateWindow("Ultra Engine", 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, 10, 0);
    camera->SetClearColor(0.125);

    //Sunlight
    auto light = CreateDirectionalLight(world);
    light->SetRotation(45, 35, 0);
    
    //Create terrain
    auto terrain = CreateTerrain(world, 512, 512);
    //terrain->LoadHeightmap("https://raw.githubusercontent.com/UltraEngine/Documentation/master/Assets/Terrain/512.r16");
    //terrain->SetScale(1, 100, 1);

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

    world->RecordStats(true);

    //Main loop
    while (window->Closed() == false and window->KeyDown(KEY_ESCAPE) == false)
    {
        window->SetText(world->renderstats.framerate);

        world->Update();
        world->Render(framebuffer, false);
    }
    return 0;
}

 

[Josh]

I tried the scene I created and uploaded above, and it produces the same results.

In order to investigate this further, I will need a specific scene or program I can test. My attempts to produce any problem are working as expected.

[Alienhead]

I can no longer test this, the lag was happening when I was on an AMD GPU, I have no such stuttering with nvidia gpu's.

 

[Josh]

28 minutes ago, Alienhead said:

I can no longer test this, the lag was happening when I was on an AMD GPU, I have no such stuttering with nvidia gpu's.

Okay, what GPU was it, for future reference?

[Alienhead]

XFX Speedster SWFT210

Now I'm running a Gigabyte GeForce RTX 4070, and most of my reported glitches are no more.