How do I correctly setup a quad in a 3D Orthographic view?

[asu4net]

Hi, I'm trying to start a simple 2D platformer and I want to use a 3D Orthographic camera, because I prefer a "world based" coordinate system. The problem is that I'm drawing a rect using that view but I can't see it. But instead, if I draw a 3D cube it works perfectly fine. I don't know how the things work behind the scenes here, but a rect should be just a quad with a texture, why it behaves different than the cube?

int main(void)
{
    constexpr int screenWidth = 1280;
    constexpr int screenHeight = 720;

    InitWindow(screenWidth, screenHeight, "raylib [core] example - basic window");

    SetTargetFPS(120);

    Camera3D camera = { 0 };
    camera.target = { .0f, .0f };
    camera.position = { .0f, .0f, 1.f };
    camera.projection = CAMERA_ORTHOGRAPHIC;
    camera.fovy = 5.f;
    camera.up = { .0f, 1.0f, .0f };

    Vector2 position = { 0.f, 0.f };

    Rectangle rec;

    rec.width = 1.f;
    rec.height = 1.f;

    float speed = 3;

    while (!WindowShouldClose())
    {
        // Draw
        //----------------------------------------------------------------------------------
        BeginDrawing();

        ClearBackground(GRAY);
        
        BeginMode3D(camera);

        Vector2 moveDir = Vector2Zero();

        if (IsKeyDown(KEY_W))
        {
            moveDir.y += 1;
        }

        if (IsKeyDown(KEY_S))
        {
            moveDir.y -= 1;
        }
        
        if (IsKeyDown(KEY_D))
        {
            moveDir.x += 1;
        }
        
        if (IsKeyDown(KEY_A))
        {
            moveDir.x -= 1;
        }

        moveDir = Vector2Normalize(moveDir);
        position = Vector2Add(position, Vector2Scale(moveDir, speed * GetFrameTime()));

        rec.x = position.x;
        rec.y = position.y;

        //DrawCube(Vector3(position.x, position.y, 0), 1, 1, 1, BLUE);
        DrawRectangleRec(rec, RED);

        EndMode3D();
        EndDrawing();
    }

    CloseWindow();
    return 0;
}

[casperbear]

DrawRectangleRec(rec, RED); should be probably called before BeginMode3D(camera); or after EndMode3D(); Of course you can only pass screen coordinates there, not world coordinates.
And if you want to draw a single colored rectangle in 3D space you should use DrawPlane(Vector3 centerPos, Vector2 size, Color color);
And if you need not a horizontally oriented rectangle, you can take the code of DrawPlane from RayLib source and create a function for your needs.