This code should be fairly self-explanatory – it looks at an input texture and, if a pixel colour is within a certain tolerance of the chosen key colour, it is made transparent (you may be familiar with this technique as “chromakey”, or “green/blue screen” used in film special effects).Ĭreate a material using this shader, and choose the key colour that you want to replace (and change the tolerance if necessary). If (deltaR < _TransparencyTolerance & deltaG < _TransparencyTolerance & deltaB < _TransparencyTolerance) If colour is within tolerance, write a transparent pixel Calculate the different in each component from the chosen transparency colourįloat deltaR = abs(colour.r - _TransparentColourKey.r) įloat deltaG = abs(colour.g - _TransparentColourKey.g) įloat deltaB = abs(colour.b - _TransparentColourKey.b) What is the colour that *would* be rendered here?įloat4 colour = tex2D(_MainTex, input.uv)

Output.pos = mul (UNITY_MATRIX_MVP, input.pos)

_TransparencyTolerance ('Transparency Tolerance', Float) = 0.01 _TransparentColourKey ('Transparent Colour Key', Color) = (0,0,0,1)

Unity notepad++ editor