So I want to create one of these in my directX11 project.

The little axis there that shows you the direction.

I have a nice 3d shader for my world geometry that I tweaked from Frank D. Luna (He writes books on directX.) and another for my 2D UI so I thought I'd look at those and see what I could conjure up since I didn't know all that much about shaders to begin with. But this is what I came up with.

float4x4 gWorldViewProj;
Texture2D gDiffuseMap;

SamplerState samLinear
{
    Filter = MIN_MAG_MIP_LINEAR;
    AddressU = WRAP;
    AddressV = WRAP;
};

struct VertexIn
{
    float3 PosL    : POSITION;
    float3 NormalL : NORMAL;
    float2 Tex     : TEXCOORD;
};

struct VertexOut
{
    float4 PosH       : SV_POSITION;
    float2 Tex        : TEXCOORD;
};

VertexOut VS(VertexIn vin)
{
    VertexOut vout;

    // Transform to homogeneous clip space.
    vout.PosH = mul(float4(vin.PosL, 1.0f), gWorldViewProj);

    // There are no transformations for texture coordinates.
    vout.Tex = vin.Tex;

    return vout;
}

float4 PS(VertexOut pin, uniform bool gUseTexure, uniform bool gAlphaClip) : SV_Target
{
    // Default to multiplicative identity.
    float4 texColor = float4(1, 1, 1, 1);
    if (gUseTexure)
    {
        // Sample texture.
        texColor = gDiffuseMap.Sample(samLinear, pin.Tex);

        if (gAlphaClip)
        {
            // Discard pixel if texture alpha < 0.1.
            clip(texColor.a - 0.1f);
        }
    }

    return texColor;
}

This code works if I pass in a quad and render a texture too it. Then for gWorldViewProj I give it just the world matrix of the UI. Renders fine.

But when I tried it with 3D objects (anything that wasn't a quad.) nothing would render. The only way I could get it to render is by passing in world * view * proj but then it rotates around the scene when you look around because of the view matrix.

So the obvious work around was to create a view matrix with no transformations and that worked.

I thought I could just give it world matrix since that's what I did with the 2D UI. I also tried world * proj but no prevail. Why does this shader only render quads without the view matrix?

So I want to create one of these in my directX11 project.

The little axis there that shows you the direction.

I have a nice 3d shader for my world geometry that I tweaked from Frank D. Luna (He writes books on directX.) and another for my 2D UI so I thought I'd look at those and see what I could conjure up since I didn't know all that much about shaders to begin with. But this is what I came up with.

float4x4 gWorldViewProj;

struct VertexIn
{
    float3 PosL    : POSITION;
    float3 NormalL : NORMAL;
    float2 Tex     : TEXCOORD;
};

struct VertexOut
{
    float4 PosH       : SV_POSITION;
    float2 Tex        : TEXCOORD;
};

VertexOut VS(VertexIn vin)
{
    VertexOut vout;

    // Transform to homogeneous clip space.
    vout.PosH = mul(float4(vin.PosL, 1.0f), gWorldViewProj);

    // There are no transformations for texture coordinates.
    vout.Tex = vin.Tex;

    return vout;
}

This code works if I pass in a quad and render a texture too it. Then for gWorldViewProj I give it just the world matrix of the UI. Renders fine.

But when I tried it with 3D objects (anything that wasn't a quad.) nothing would render. The only way I could get it to render is by passing in world * view * proj but then it rotates around the scene when you look around because of the view matrix.

So the obvious work around was to create a view matrix with no transformations and that worked.

I thought I could just give it a world matrix since that's what I did with the 2D UI. I also tried world * proj but no prevail. Why does this shader render quads without a view matrix but can't render other more complex sets of geometry without the view matrix. Here is how I generated the quad.