I'm trying to understand the basics of directional lighting, i have a very simple demo with a few axes (i mean the weapon), instanced in different positions, some of them rotated, and i'm using the light.ps shader file i found in this tutorial http://www.rastertek.com/dx11tut09.html in order to add a directional light to the scene.

As you can see from the screenshot below, the light always hits the left side of the axes, like if the directional light vector (pointing at (0,0,-1) is being considered relative to the position of every axe, instead of being fixed to the z negative axis of the scene.

Could you help me on this one?

thanks

mmm, these are the only lines where i touch the normals in the vertex shader:

// Calculate the normal vector against the world matrix only.

output.normal = mul(input.normal, (float3x3)worldMatrix);

// Normalize the normal vector.

output.normal = normalize(output.normal);

i attached the vertex shader below, it's based on the tutorial with a few modifications, in particular i had to add some calculations to translate and rotate the instances in the correct position, i don't know if it's the best approach (and it might be the root of my problems..) , i just couldn't find any example for it.

thank you!!! that was stupid... you were right, these are the modified lines:

output.normal = mul(input.normal,composition);

output.normal = mul(output.normal, (float3x3)worldMatrix);

I'm going to upvote you because of your avatar Bud is a legend!