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Colour interference when two surfaces overlap

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xin
xin on 18 Jun 2024
Commented: xin on 19 Jun 2024
Colour interference when two surfaces overlap, how to solve it?

Answers (1)

Piyush Kumar
Piyush Kumar on 18 Jun 2024
Edited: Piyush Kumar on 18 Jun 2024
Hi @xin,
If you are talking about the blending of colours at the point where surfaces intersect or overlap, I will try to explain with an example.
[X,Y] = meshgrid(linspace(-2, 2, 50));
Z = @(x,y,c) x.^2 + y.^2 + c;
figure(1)
surf(X, Y, +Z(X,Y,-4), 'FaceColor','g', 'FaceAlpha',0.5, 'EdgeColor','none')
hold on
surf(X, Y, -Z(X,Y,-4), 'FaceColor','r', 'FaceAlpha',0.5, 'EdgeColor','none')
hold off
grid on
I have specified only 2 colours for the 2 surfaces repectively, but multiple colours are visible. This blending effect is a result of the rendering process in MATLAB, where the semi-transparent (due to 'FaceAlpha',0.5) surfaces allow for the underlying color to show through, creating a visual effect of color mixing or interference.
To avoid this color blending effect and maintain the solid colors you've specified without seeing a mix at the intersections, you can:
  • Increase the Opacity: Setting 'FaceAlpha' to 1 (or removing the 'FaceAlpha' setting, as its default value is 1) will make the surfaces fully opaque, preventing the underlying color from showing through.
[X,Y] = meshgrid(linspace(-2, 2, 50));
Z = @(x,y,c) x.^2 + y.^2 + c;
figure(1)
% Making the surfaces opaque by removing 'FaceAlpha'
surf(X, Y, +Z(X,Y,-4), 'FaceColor','g', 'EdgeColor','none')
hold on
surf(X, Y, -Z(X,Y,-4), 'FaceColor','r', 'EdgeColor','none')
hold off
grid on
  4 Comments
xin
xin on 19 Jun 2024
Of course,please import the data into the workspace at first.

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