Fix Cycles division by zero in material preview render
If the render gets cancelled before the first sample finishes.
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@ -750,6 +750,11 @@ double RenderScheduler::guess_display_update_interval_in_seconds_for_num_samples
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int RenderScheduler::calculate_num_samples_per_update() const
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{
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const double time_per_sample_average = path_trace_time_.get_average();
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/* Fall back to 1 sample if we have not recorded a time yet. */
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if (time_per_sample_average == 0.0) {
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return 1;
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}
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const double num_samples_in_second = pixel_size_ * pixel_size_ / time_per_sample_average;
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const double update_interval_in_seconds = guess_display_update_interval_in_seconds();
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