NCurses 3D Render Engine Tutorial 12 (Precursor explanation)
MISTAKE:
I made a small mistake in my description of the solution. You must divide the values by z before you interpolate between them to account for the perspective divide. Interpolated value = v1/z1*w1+...
In this video I describe exactly what we will implement in the video and the math behind it. I also cover some common pitfalls and solutions to those problems.
Barycentric coordinates:
https://www.scratchapixel.com/lessons...
Github: https://github.com/youngbrycecode/Ren...
Chapters:
0:00 Introduction
0:10 Pipeline
1:20 Barycentric Interpolation
2:11 Naive approach
3:00 Correct approach
Pipeline:
1. Get floats from vertex shader
2. Interpolate between them
3. Pass to fragment shader and render with result
Common pitfall:
Using affine space barycentric interpolation.
Corrected solution:
float inverseZ = 1/z1 * w1 + 1/z2 * w2 + 1/z3 * w3;
float interpolatedValue = value1 * w1 + value2 * w2 + value3 * w3;
float finalInterpolation = interpolatedValue / inverseZ;
//pass to fragment shader
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