Zetha Posted August 18, 2017 Share Posted August 18, 2017 (edited) Hi, Why is it necessary to post-compute normals with with nodes like facet or normal? Aren´t the normals always there there in a surface? And... if a normal is supposed to be perpendicular to a surface, what is happening when you change its direction? Edited August 18, 2017 by Zetha Quote Link to comment Share on other sites More sharing options...
f1480187 Posted August 19, 2017 Share Posted August 19, 2017 (edited) 1. No need to compute normals without a good reason. Some nodes may use existing normals to output nicer results. Notable example is the Voronoi Fracture transferring input normals to outer surface. Other nodes may output worse-looking result with degenerate normals. Notable example is also the Voronoi Fracture: it cannot transfer to inside surface because it didn't exist on the input. 2. If there is no normal attribute on geometry, Houdini will internally compute some for display. 3. If you change direction of the normal, surface will be shaded as if it was perpendicular at that point. That's how normal mapping works. normal_examples.hipnc Edited August 19, 2017 by f1480187 Quote Link to comment Share on other sites More sharing options...
Zetha Posted August 19, 2017 Author Share Posted August 19, 2017 Thanks, I will study that archive Quote Link to comment Share on other sites More sharing options...
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