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/*
* Copyright 2011-2016 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <cstdlib>
#include "render/camera.h"
#include "blender/blender_object_cull.h"
#include "blender/blender_util.h"
CCL_NAMESPACE_BEGIN
BlenderObjectCulling::BlenderObjectCulling(Scene *scene, BL::Scene &b_scene)
: use_scene_camera_cull_(false),
use_camera_cull_(false),
camera_cull_margin_(0.0f),
use_scene_distance_cull_(false),
use_distance_cull_(false),
distance_cull_margin_(0.0f)
{
if (b_scene.render().use_simplify()) {
PointerRNA cscene = RNA_pointer_get(&b_scene.ptr, "cycles");
use_scene_camera_cull_ = scene->camera->type != CAMERA_PANORAMA &&
!b_scene.render().use_multiview() &&
get_boolean(cscene, "use_camera_cull");
use_scene_distance_cull_ = scene->camera->type != CAMERA_PANORAMA &&
!b_scene.render().use_multiview() &&
get_boolean(cscene, "use_distance_cull");
camera_cull_margin_ = get_float(cscene, "camera_cull_margin");
distance_cull_margin_ = get_float(cscene, "distance_cull_margin");
if (distance_cull_margin_ == 0.0f) {
use_scene_distance_cull_ = false;
}
}
}
void BlenderObjectCulling::init_object(Scene *scene, BL::Object &b_ob)
{
if (!use_scene_camera_cull_ && !use_scene_distance_cull_) {
return;
}
PointerRNA cobject = RNA_pointer_get(&b_ob.ptr, "cycles");
use_camera_cull_ = use_scene_camera_cull_ && get_boolean(cobject, "use_camera_cull");
use_distance_cull_ = use_scene_distance_cull_ && get_boolean(cobject, "use_distance_cull");
if (use_camera_cull_ || use_distance_cull_) {
/* Need to have proper projection matrix. */
scene->camera->update(scene);
}
}
bool BlenderObjectCulling::test(Scene *scene, BL::Object &b_ob, Transform &tfm)
{
if (!use_camera_cull_ && !use_distance_cull_) {
return false;
}
/* Compute world space bounding box corners. */
float3 bb[8];
BL::Array<float, 24> boundbox = b_ob.bound_box();
for (int i = 0; i < 8; ++i) {
float3 p = make_float3(boundbox[3 * i + 0], boundbox[3 * i + 1], boundbox[3 * i + 2]);
bb[i] = transform_point(&tfm, p);
}
bool camera_culled = use_camera_cull_ && test_camera(scene, bb);
bool distance_culled = use_distance_cull_ && test_distance(scene, bb);
return ((camera_culled && distance_culled) || (camera_culled && !use_distance_cull_) ||
(distance_culled && !use_camera_cull_));
}
/* TODO(sergey): Not really optimal, consider approaches based on k-DOP in order
* to reduce number of objects which are wrongly considered visible.
*/
bool BlenderObjectCulling::test_camera(Scene *scene, float3 bb[8])
{
Camera *cam = scene->camera;
const ProjectionTransform &worldtondc = cam->worldtondc;
float3 bb_min = make_float3(FLT_MAX, FLT_MAX, FLT_MAX),
bb_max = make_float3(-FLT_MAX, -FLT_MAX, -FLT_MAX);
bool all_behind = true;
for (int i = 0; i < 8; ++i) {
float3 p = bb[i];
float4 b = make_float4(p.x, p.y, p.z, 1.0f);
float4 c = make_float4(
dot(worldtondc.x, b), dot(worldtondc.y, b), dot(worldtondc.z, b), dot(worldtondc.w, b));
p = float4_to_float3(c / c.w);
if (c.z < 0.0f) {
p.x = 1.0f - p.x;
p.y = 1.0f - p.y;
}
if (c.z >= -camera_cull_margin_) {
all_behind = false;
}
bb_min = min(bb_min, p);
bb_max = max(bb_max, p);
}
if (all_behind) {
return true;
}
return (bb_min.x >= 1.0f + camera_cull_margin_ || bb_min.y >= 1.0f + camera_cull_margin_ ||
bb_max.x <= -camera_cull_margin_ || bb_max.y <= -camera_cull_margin_);
}
bool BlenderObjectCulling::test_distance(Scene *scene, float3 bb[8])
{
float3 camera_position = transform_get_column(&scene->camera->matrix, 3);
float3 bb_min = make_float3(FLT_MAX, FLT_MAX, FLT_MAX),
bb_max = make_float3(-FLT_MAX, -FLT_MAX, -FLT_MAX);
/* Find min & max points for x & y & z on bounding box */
for (int i = 0; i < 8; ++i) {
float3 p = bb[i];
bb_min = min(bb_min, p);
bb_max = max(bb_max, p);
}
float3 closest_point = max(min(bb_max, camera_position), bb_min);
return (len_squared(camera_position - closest_point) >
distance_cull_margin_ * distance_cull_margin_);
}
CCL_NAMESPACE_END
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