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struct fisheye { miColor outside_color; }; miBoolean fisheye (miColor *result, miState *state, struct fisheye *params ) { miVector camera_direction; miScalar center_x = state->camera->x_resolution / 2.0; miScalar center_y = state->camera->y_resolution / 2.0; miScalar radius = center_x < center_y ? center_x : center_y; miScalar distance_from_center = miaux_distance(center_x, center_y, state->raster_x, state->raster_y); if (distance_from_center < radius) { mi_vector_to_camera(state, &camera_direction, &state->dir); camera_direction.z *= miaux_fit(distance_from_center, 0, radius, 1, 0); mi_vector_normalize(&camera_direction); mi_vector_from_camera(state, &camera_direction, &camera_direction); return mi_trace_eye(result, state, &state->org, &camera_direction); } else { *result = *mi_eval_color(¶ms->outside_color); return miTRUE; } }
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