Many‐light rendering is becoming more common and important as rendering goes into the next level of complexity. However, to calculate the illumination under many lights, state of the art algorithms are still far from efficient, due to the separate consideration of light sampling and BRDF sampling. To deal with the inefficiency of many‐light rendering, we present a novel light sampling method named BRDF‐oriented light sampling, which selects lights based on importance values estimated using the BRDF's contributions. Our BRDF‐oriented light sampling method works naturally with MIS, and allows us to dynamically determine the number of samples allocated for different sampling techniques. With our method, we can achieve a significantly faster convergence to the ground truth results, both perceptually and numerically, as compared to previous many‐light rendering algorithms.
The 32nd International Young Physicists’ Tournament (IYPT), a physics competition for students in schools, settled up a problem for the Moiré thread counter. The problem mentioned to design an overlay to measure the thread count of the fabric. In this paper, we made one kind of Moiré pattern-based thread counter by printing the designed overlay on the plastic paper. As a contrast, we also constructed a self-made CCD camera assisted imaging system and studied the thread count. We used a 1951 USAF resolution test chart and MATLAB software for imaging analysis. Ten kinds of simple cloth were prepared, and their thread count measured. The results and the accuracy of the two methods were discussed.
A new integral image (InIm) 3D display with an adaptive liquid crystal (LC) microlens array is proposed. By optimizing the InIm system parameters, our LC lens could achieve video rate and a large dynamic range.
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