Thin film interference effect drawing method based on ray tracer

Abstract

The invention discloses a thin film interference effect drawing method based on a ray tracer. The thin film interference effect drawing method based on the ray tracer comprises the following steps: obtaining multi-layer thin film mixed reflectivity and transmittance by applying a multi-beam interference equation, wherein single-layer film surface reflection coefficient and transmission coefficient can be determined by a Fresnel formula, and a refraction angle in the thin film obeys a Snell law; introducing in a rough surface scattering coefficient by considering that certain thin films generate the irregularity of reflection or transmission light distribution due to roughness to correct the thin film reflectivity and transmittance and simulate complex optical effects, such as colorful highlight, anisotropy and the like; and on the basis of a ray tracer imaging mechanism, constructing a link between physical optics and geometrical optics, and generating a whole scattering formula. The capability of the traditional ray tracer on drawing fluctuation effect is effectively improved, the invention can be continuously integrated into classical 3D modeling software Maya in a plugin way, so that a user obtains required colorful fluctuation effect directly through the modeling software to further improve the drawing capability of the modeling software which takes Maya as a representative, and the invention exhibits high application value.

Description

technical field [0001] The invention relates to a thin-film interference effect drawing method based on a ray tracer, which can apply wave theory to draw a single-layer or multi-layer thin-film interference effect in a ray tracer based on geometric optics, and belongs to the field of realistic rendering of computer graphics imaging. Background technique [0002] Photorealistic rendering (Photorealistic Rendering) is the mainstream rendering technology of existing modeling software such as Maya, 3DMax, etc. It is different from non-realistic rendering technology. Realistically simulate scene information. Most of the existing realistic rendering technologies are based on ray tracers, which use the principle of ray tracing to simulate the propagation process of light in the space scene; by obtaining the material properties of the object, calculate the reflectance or transmittance of light on the object surface, and then recursively trace the light, Finally, the spectral contri...

AI Technical Summary

Problems solved by technology

[0009] In order to overcome the difficulty of drawing the wave effect of the ray tracer, the present invention proposes a method for drawing the interference effect of multi-layer thin films based on ray tracing, which combines the theory of physical optics with ray tracing technology to effectively improve the existing ray tracer ( Such as the ability of PBRT) to draw wave effects; the present invention can also be integrated into the classic 3D modeling software Maya in the form of a plug-in, so that users can directly construct any desired scene and perform spectral rendering through the modeling software , to obtain the required color fluctuation effect, which further improves the drawing ability of the modeling software represented by Maya, which has high application value

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