Smooth Shading Gouraud Phong

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Presentation transcript:

Smooth Shading Gouraud Phong CSE 681

Interpolate value(s) for point in face from values at vertices http://www.blancmange.info/notes/maths/vectors/primitives/ CSE 681

Compute normals at vertices For each vertex, v Nv = <0,0,0> For each face of vertex Compute face normal Nv += face normal Normalize Nv For each vertex, v Nv = <0,0,0> For each face Compute face normal For each vertex of face Nv += face normal Normalize Nv CSE 681

Interpolate value(s) for point in face from values at vertices Gouraud smooth shading: Compute normals at vertices Compute color at vertices Interpolate interior color CSE 681

Mach Band Effect Smoothly shaded objects Colors are continuous, but not derivatives Eye picks up on this and accentuates discontinuity CSE 681

Interpolate value(s) for point in face from values at vertices Phong smooth shading: Compute normals at vertices Interpolate interior normal Compute color at point CSE 681

Interpolate value(s) for point in face from values at vertices CSE 681

Interpolate value(s) scanline algorithms Interpolate down edges, across scanline CSE 681

Point sample Quadrilateral inverse binlinear map then use u,v values to interpolate CSE 681

Point sample Triangle compute barycentric coordinates then use to interpolate Pc b P a c Pa Pb Normalized so that a+b+c=1 P=aPa+bPb+cPc CSE 681

Area of a triangle - using vector algebra Pc Area = (1/2)h|Vab| h = |Vbc |sin(q) h Area = (1/2) |Vab| |Vbc |sin(q) Pa q |Vab x Vbc| = |Vab | |Vbc|sin(q) Pb Area = (1/2) |Vab x Vbc| CSE 681

Examples of smooth shading See links off of course web site CSE 681