从数组中绘制三角形 [英] Drawing triangles from an array

问题描述

嗨.

可以说我有一个浮点数数组:

 浮动 []点= { 1 . 0 . 0 . 1 . 0 ， 1 . 0 ，
 1 . 0 ， 1 . 0 ， 1 . 0 };  



这是ex三角形上的一个点，其中前3个浮点是坐标，后2个是纹理坐标，后3个是法线坐标.



如何使用GLSL在OpenGL中快速绘制此图像(如果需要)?
解决方案
 
我从来没有在OpenGL中做过任何事情.但指的是 MSDN  [ 浮动 []点= {
     1  .0F， 0  .0F， 0  .5F，
     1  .0F， 1  .0F，
     1  .0F， 1  .0F， 1  .0F
};

glNormal3f(points [ 0 ]，points [ 1 ]，points [ 3 ]，points [ 4 ]);
glVertex3f(points [ 5 ]，points [ 6 ]，points [ // 自定义数据持有者类的定义
类 TriangleCoordinages
{
     public   float  NormalX，NormalY，NormalZ；
     public   float  TextureX，TextureY;
     public   float  LocationX，LocationY，LocationZ;

    公共 TriangleCoordinates(
         float  normalX， float  normalY， float  normalZ ，
         float  textureX， float  textureY，
         float  locationX， float  locationY， float  locationZ
    ){
        NormalX = normalX;
        NormalY = normalY;
        NormalZ = normalZ;
        TextureX = textureX;
        TextureY = textureY;
        LocationX = locationX;
        LocationY = locationY;
        LocationZ = locationZ;
    }
}

// 数据持有者对象的实例化
TriangleCoordinates triangle = 新 TriangleCoordinates(
     1  .0F， 0  .0F， 0  .5F，
     1  .0F， 1  .0F，
     1  .0F， 1  .0F， 1  .0F
);

// 在数据持有者对象中使用数据
glNormal3f(triangle.NormalX，triangle.NormalY，triangle.NormalZ);
glTexCoord2f(triangle.TextureX，triangle.TextureY);
glVertex3f(triangle.LocationX，triangle.LocationY，triangle.LocationZ); 

Hi.

Lets say i have an array of floats:

float[] points = {1.0, 0.0, 0.5,
1.0, 1.0,
1.0, 1.0, 1.0};

This is one point on ex a triangle, where the first 3 floats are coordinates, the 2 next texture coordinates, and the last 3 normal coordinates.

How do i fast draw this in OpenGL using GLSL(If needed)?

解决方案

I''ve never done anything in OpenGL. But referring to MSDN[^], I suggest

float[] points = {
    1.0F, 0.0F, 0.5F,
    1.0F, 1.0F,
    1.0F, 1.0F, 1.0F
};

glNormal3f(points[0], points[1], points[2]);
glTexCoord2f(points[3], points[4]);
glVertex3f(points[5], points[6], points[7]);

points is an array. You can access its elements using the correct index in square brackets. Be careful not to use a non-existent index for it will result in an exception.

Have you considered to use a custom object with more descriptive naming for the floats? (I don''t know the performance penalty, though). It could read something like that:

// Definition of your custom data holder class
class TriangleCoordinages
{
    public float NormalX, NormalY, NormalZ;
    public float TextureX, TextureY;
    public float LocationX, LocationY, LocationZ;

    public TriangleCoordinates(
        float normalX, float normalY, float normalZ,
        float textureX, float textureY,
        float locationX, float locationY, float locationZ
    ){
        NormalX = normalX;
        NormalY = normalY;
        NormalZ = normalZ;
        TextureX = textureX;
        TextureY = textureY;
        LocationX = locationX;
        LocationY = locationY;
        LocationZ = locationZ;
    }
}

// Instantiation of a data holder object
TriangleCoordinates triangle = new TriangleCoordinates(
    1.0F, 0.0F, 0.5F,
    1.0F, 1.0F,
    1.0F, 1.0F, 1.0F
);

// Using data within the data holder object
glNormal3f(triangle.NormalX, triangle.NormalY, triangle.NormalZ);
glTexCoord2f(triangle.TextureX, triangle.TextureY);
glVertex3f(triangle.LocationX, triangle.LocationY, triangle.LocationZ);

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