Question

我一直试图在我的代码中找出这个错误很长一段时间，现在我正在寻求stackoverflow的帮助！无论如何，我已经创建了一个用于在openGL中创建模型的类。它处理给定模型的VBO，VAO和EBO，但是当我创建两个并显示它们时，第二个总是覆盖前一个/一个我不明白为什么，我向我的一个朋友展示它，我们一起一无所获。这是模型类：

using OpenTK;
using OpenTK.Graphics;
using OpenTK.Graphics.OpenGL4;
using System;

namespace YISOPENGLEVIL.Components.Objects
{
struct Vertex
{
    Vector3 Position;
    Vector3 Color;
    public Vertex(Vector3 position, Vector3 color)
    {
        Position = position;
        Color = color;
    }
}
class Model
{
    public int VBO, VAO, EBO;
    public Vertex[] Data;
    public int[] Indices;
    public Model() { }
    public Model(Vertex[] data, int[] indices)
    {
        Data = data;
        Indices = indices;

        VAO = GL.GenVertexArray();
        VBO = GL.GenBuffer();
        EBO = GL.GenBuffer();
        GL.BindVertexArray(VAO);
        GL.BindBuffer(BufferTarget.ArrayBuffer, VBO);
        GL.BufferData(BufferTarget.ArrayBuffer, Data.Length * 24, Data, BufferUsageHint.StaticDraw);
        GL.VertexAttribPointer(0, 3, VertexAttribPointerType.Float, false, 24, 0);
        GL.VertexAttribPointer(1, 3, VertexAttribPointerType.Float, false, 24, 12);

        GL.BindBuffer(BufferTarget.ElementArrayBuffer, EBO);
        GL.BufferData(BufferTarget.ElementArrayBuffer, Indices.Length * 4, Indices, BufferUsageHint.StaticDraw);

        GL.EnableVertexAttribArray(0);
        GL.EnableVertexAttribArray(1);
    }
    protected static Vector3 toVec3(Color4 c)
    {
        return new Vector3(c.R, c.G, c.B);
    }
    public void Render()
    {
        //GL.DrawArrays(PrimitiveType.Triangles, 0, Data.Length);
        GL.DrawElements(BeginMode.Triangles, Indices.Length, DrawElementsType.UnsignedInt, 0);
    }
}
}

然后我的Element类被传递给Model，然后用它来显示它，

using OpenTK;
using System.Collections.Generic;
using OpenTK.Graphics.OpenGL4;

namespace YISOPENGLEVIL.Components.Objects
{
class Element
{
    private int transform;
    private int s;
    public Vector3 Position;
    public Vector3 Rotation;
    private Matrix4 View;
    private Model Model;

    public Element(Model m, int Shader)
    {
        s = Shader;
        Model = m;
        Position = new Vector3(0, 0, 0);
        Rotation = new Vector3(0, 0, 0);
    }
    public void Render()
    {
        var t = Matrix4.CreateTranslation(Position.X, Position.Y, Position.Z);
        var rx = Matrix4.CreateRotationX(Rotation.X);
        var ry = Matrix4.CreateRotationY(Rotation.Y);
        var rz = Matrix4.CreateRotationZ(Rotation.Z);

        View = t * rx * ry * rz;

        transform = GL.GetUniformLocation(s, "transform");
        GL.UniformMatrix4(transform, false, ref View);

        Model.Render();
    }
    public static void RenderAll()
    {

    }
}
}

这是实施：

        m1 = new Cube(1.5f, Color4.Aqua);
        m2 = new Cube(1f, Color4.Red);
        e1 = new Element(m1, s.Program);
        e2 = new Element(m2, s.Program);
        e1.Position = new Vector3(0, 0, 0);
        e2.Position = new Vector3(0, 0, 1);

和

        e1.Render();
        e2.Render();

cube类扩展了Model，并通过创建顶点数组的私有静态方法将数据传递给Model构造函数。真正奇怪的是，如果我把print语句显示两个元素都被定义得很好并且有正确的数据，那么最后一个总是覆盖前一个（在正确的位置有两个对象，但都显示红色的小立方体）。我不明白......有什么想法吗？

程序的屏幕截图

OpenGL模型覆盖以前的模型

0 个答案: