Normals: Difference between revisions
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== dFdx/dFdy == |
== dFdx/dFdy method == |
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You can calculate normals in the fragment shader without passing any vertex normals either to or from the vertex shader. However, that these normals will not interpolate across faces. |
You can calculate normals in the fragment shader without passing any vertex normals either to or from the vertex shader. However, that these normals will not interpolate across faces. |
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} |
} |
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</source> |
</source> |
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=== See also === |
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* https://medium.com/@bgolus/generating-perfect-normal-maps-for-unity-f929e673fc57 {{TODO|expand}} |
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[[Category:Graphics programming]] |
[[Category:Graphics programming]] |
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Latest revision as of 13:51, 24 February 2020
dFdx/dFdy method
You can calculate normals in the fragment shader without passing any vertex normals either to or from the vertex shader. However, that these normals will not interpolate across faces.
in vec3 vertex_coord;
// https://community.khronos.org/t/getting-the-normal-with-dfdx-and-dfdy/70177
// http://web.archive.org/web/20120302100158/http://athile.net/library/blog/?tag=dfdx
vec3 normal()
{
vec3 x = dFdx(vertex_coord);
vec3 y = dFdy(vertex_coord);
return normalize(cross(x, y));
}