Monogame中伪3D道路效果异常问题求助

我正在尝试在Monogame中实现伪3D道路效果，已完成道路直行及循环功能，但添加曲线和山坡后出现两个异常：

• 道路下方线条过渡不流畅
• 道路被大幅拉伸（此前长度显示正常）

当前异常代码 #

public void Draw()
{
    carX += Basic.elapsedTime * 5;
    float vertical = Basic.height;
    float drawDistance = 1f;

    while (drawDistance < roadLength)
    {
        float lastVertical = vertical;

        while (vertical >= lastVertical && drawDistance < roadLength)
        {
            drawDistance += drawDistance / 150;
            float x = carX + drawDistance;
            float scale = 1 / drawDistance;

            //hills
            float z = (float)(200 + 80 * Math.Sin(x / 13) - 120 * Math.Sin(x / 7));
            vertical = (int)(60 + Basic.height * scale + z * scale);
            //hills

            if (drawDistance < roadLength)
            {
                //curve
                float y = (float)(200 * Math.Sin(x / 17) + 170 * Math.Sin(x / 8));
                float horizontal = (Basic.width / 2) - ((roadSize.X / 2) - y) * scale;
                //curve

                Rectangle roadSlice = new Rectangle(0, (int)(100*x % roadSize.Y), (int)roadSize.X, 1);

                Basic.spriteBatch.Draw(Textures.road, new Vector2(horizontal, vertical), roadSlice, Color.White, 0.0f, Vector2.Zero, new Vector2(scale, 1), SpriteEffects.None, 0);
            }
        }
    }
}

异常效果截图 #

添加山坡前的正常代码 #

public Track()
{
    roadSize = new Vector2(Textures.road.Width, Textures.road.Height);
    roadLength = roadSize.Y / 3.0f;
}

public void Draw()
{
    for (int i = 0; i < roadLength; i++)
    {
        float scale = ((roadLength - i) / roadLength) * 2;
        float x = carX + i / scale;

        //curve
        float y = (float)(200 * Math.Sin(x / 1170) + 170 * Math.Sin(x / 580));
        float horizontal = (Basic.width / 2) - ((roadSize.X / 2) - y) * scale;
        //curve

        float vertical = Basic.height - i;

        Rectangle roadSlice = new Rectangle(0, (int)(x % roadSize.Y), (int)roadSize.X, 1);

        Basic.spriteBatch.Draw(Textures.road, new Vector2(horizontal, vertical), roadSlice, Color.White, 0.0f, Vector2.Zero, new Vector2(scale, 1), SpriteEffects.None, 0);
    }
}

问题 #

1. 如何修复上述异常，实现道路线条的平滑过渡？
2. 是否有基于纹理切片的Monogame/C#伪3D道路示例？

内容的提问来源于stack exchange，提问作者Canox