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light: phong shading: also weight by face area. this avoids cubes with rounded edges turning completely into blobs

This commit is contained in:
Eric Wasylishen 2016-04-05 15:00:12 -06:00
parent bae924ebd0
commit bbc95a1364
1 changed files with 15 additions and 3 deletions
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18
light/light.cc
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@ -331,6 +331,17 @@ AngleBetweenPoints(const vec3_t p1, const vec3_t p2, const vec3_t p3)
return result;
}
static vec_t
TriangleArea(const vec3_t v0, const vec3_t v1, const vec3_t v2)
{
vec3_t edge0, edge1, cross;
VectorSubtract(v2, v0, edge0);
VectorSubtract(v1, v0, edge1);
CrossProduct(edge0, edge1, cross);
return VectorLength(cross) * 0.5;
}
class vec3_struct_t {
public:
vec3_t v;
@ -350,14 +361,15 @@ AddTriangleNormals(std::map<int, vec3_struct_t> &smoothed_normals, const vec_t *
const vec_t *p2 = verts[v2].point;
const vec_t *p3 = verts[v3].point;
float weight;
float area = TriangleArea(p1, p2, p3);
weight = AngleBetweenPoints(p2, p1, p3);
weight = AngleBetweenPoints(p2, p1, p3) * area;
VectorMA(smoothed_normals[v1].v, weight, norm, smoothed_normals[v1].v);
weight = AngleBetweenPoints(p1, p2, p3);
weight = AngleBetweenPoints(p1, p2, p3) * area;
VectorMA(smoothed_normals[v2].v, weight, norm, smoothed_normals[v2].v);
weight = AngleBetweenPoints(p1, p3, p2);
weight = AngleBetweenPoints(p1, p3, p2) * area;
VectorMA(smoothed_normals[v3].v, weight, norm, smoothed_normals[v3].v);
}
/* small helper that just retrieves the correct vertex from face->surfedge->edge lookups */