Re: C++ code to D (multi dem 3d mesh)

Joel via Digitalmars-d-learn Tue, 27 Oct 2020 00:07:03 -0700

On Monday, 26 October 2020 at 23:38:22 UTC, Joel wrote:

```
struct vec3d
{
        float x, y, z;
}
struct triangle
{
        vec3d[3] p;
}

struct mesh
{
        triangle[] tris;
}

// This here
meshCube.tris = {

                // SOUTH
{ 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f},{ 0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 0.0f},
                // EAST
{ 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 1.0f},{ 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f},
                // NORTH
{ 1.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f},{ 1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f},
                // WEST
{ 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f},{ 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f},
                // TOP
{ 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f},{ 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f},
                // BOTTOM
{ 1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f},{ 1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f},
                };
```

See:
https://youtu.be/ih20l3pJoeU
https://github.com/OneLoneCoder/videos/blob/master/OneLoneCoder_olcEngine3D_Part1.cpp


This is what I came up with:

meshCube.tris =

        // south

[triangle(vec3d(0f,0f,0f)), triangle(vec3d(0f,1f,0f)),triangle(vec3d(1f,1f,0f)),triangle(vec3d(0f,0f,0f)), triangle(vec3d(1f,1f,0f)),triangle(vec3d(1f,0f,0f)),


        // east

triangle(vec3d(1f,0f,0f)), triangle(vec3d(1f,1f,0f)),triangle(vec3d(1f,1f,1f)),triangle(vec3d(1f,0f,0f)), triangle(vec3d(1f,1f,1f)),triangle(vec3d(1f,0f,1f)),


        // north

triangle(vec3d(1f,0f,1f)), triangle(vec3d(1f,1f,1f)),triangle(vec3d(0f,1f,1f)),triangle(vec3d(1f,0f,1f)), triangle(vec3d(0f,1f,1f)),triangle(vec3d(0f,0f,1f)),


        // west

triangle(vec3d(0f,0f,1f)), triangle(vec3d(0f,1f,1f)),triangle(vec3d(0f,1f,0f)),triangle(vec3d(0f,0f,1f)), triangle(vec3d(0f,1f,0f)),triangle(vec3d(0f,0f,0f)),


        // top

triangle(vec3d(0f,1f,0f)), triangle(vec3d(0f,1f,1f)),triangle(vec3d(1f,1f,1f)),triangle(vec3d(0f,1f,0f)), triangle(vec3d(1f,1f,1f)),triangle(vec3d(1f,1f,0f)),


        // bottom

triangle(vec3d(1f,0f,1f)), triangle(vec3d(0f,0f,1f)),triangle(vec3d(0f,0f,0f)),triangle(vec3d(1f,0f,1f)), triangle(vec3d(0f,0f,0f)),triangle(vec3d(1f,0f,0f))];

Re: C++ code to D (multi dem 3d mesh)

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