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YuemariSan

Unity CG Shader, further explanation please!

4 posts in this topic

Hi, I got a question about a shader I´ve found at Unity forums, I´m starting to get involve in the world of shaders and computer graphics, but
can´t find any guides to understand why this shader gets that effect:
The vertex shader:
v2f vert (appdata_base v)
{
v2f o;
// The vertex position in view-space (camera space)
float4 vPos = mul (UNITY_MATRIX_MV, v.vertex);
// Get distance from camera and scale it down with the global _Dist parameter
float zOff = vPos.z/_Dist;
// Add the offset with a quadratic curve to the vertex position
vPos += _QOffset*zOff*zOff;
o.pos = mul (UNITY_MATRIX_P, vPos);
o.uv = v.texcoord;
return o;
}

Could someone explain the part of the quadratic curve?, its the part that I really don´t get it.
Here is the link to the forum post:
http://answers.unity...ook-curved.html
Thanks in advance for any references or guides to understand the effect, so I can try a shader of this sort on my own.
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This is the correct link:

http://answers.unity3d.com/questions/288835/how-to-make-plane-look-curved.html

Sorry about that XD.
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[CODE]
vPos += _QOffset*zOff*zOff;
[/CODE]

This is the quadratic curve here zOff*zOff is the same as zOff^2, creating a parabola. _QOffset is probably a constant defining how pronounced the curve will be.

zOff is the distance from the viewer, basically vPos( the position of the vertex) is being offset by distance^2.
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Thanks a lot, it sounds pretty easy now. If I understand this, well enough, then I can change the aspect of the effect by changing it with other mathematical function right?, something like using Sin or Cos would make the plane to ondulate with the distance (Im making obvious that my mesh have enough vertexes).
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