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Fix orennayarbrdf.cpp: no longer try to normalizes zero vectors. #2910

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Fix orennayarbrdf.cpp: no longer try to normalizes zero vectors. #2910

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11 changes: 9 additions & 2 deletions src/appleseed/renderer/modeling/bsdf/orennayarbrdf.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -255,8 +255,15 @@ namespace

// Project outgoing and incoming vectors onto the tangent plane
// and compute the cosine of the angle between them.
const Vector3f V_perp_N = normalize(project(outgoing, n));
const Vector3f I_perp_N = normalize(incoming - n * cos_in);
// Do not use normalize() as V_perp and I_perp can be zero.
const Vector3f V_perp = project(outgoing, n);
const Vector3f I_perp = incoming - n * cos_in;
const float V_perp_norm = norm(V_perp);
const float I_perp_norm = norm(I_perp);
if (V_perp_norm == 0.0f || I_perp_norm == 0.0f)
return;
const Vector3f V_perp_N = V_perp / V_perp_norm;
const Vector3f I_perp_N = I_perp / I_perp_norm;
const float delta_cos_phi = dot(V_perp_N, I_perp_N);

// Compute C1 coefficient.
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