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Cycles microdisplacement: add max subdivision setting 

This is to prevent situations such as when the camera gets very close to a mesh
and causes it to be tessellated into an excessive amount of micropolygons. In
REYES this is known as the eye-splits problem.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D1922
This commit is contained in:
Mai Lavelle 2016-04-18 22:35:49 +02:00 committed by Brecht Van Lommel
parent 71588300d2
commit 3068ea34e4
7 changed files with 97 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
intern/cycles/blender/addon/properties.py
View File

@ -383,6 +383,13 @@ class CyclesRenderSettings(bpy.types.PropertyGroup):
default=8.0,
)
cls.max_subdivisions = IntProperty(
name="Max Subdivisions",
description="Stop subdividing when this level is reached even if the dice rate would produce finer tessellation",
min=0, max=16,
default=12,
)
cls.film_exposure = FloatProperty(
name="Exposure",
description="Image brightness scale",

2
intern/cycles/blender/addon/ui.py
View File

@ -235,6 +235,8 @@ class CyclesRender_PT_geometery(CyclesButtonsPanel, Panel):
sub.label("Subdivision Rate:")
sub.prop(cscene, "dicing_rate", text="Render")
sub.prop(cscene, "preview_dicing_rate", text="Preview")
sub.separator()
sub.prop(cscene, "max_subdivisions")
else:
row = layout.row()
row.label("Volume Sampling:")

7
intern/cycles/blender/blender_mesh.cpp
View File

@ -661,13 +661,15 @@ static void create_subd_mesh(Scene *scene,
BL::Mesh& b_mesh,
PointerRNA *cmesh,
const vector<uint>& used_shaders,
float dicing_rate)
float dicing_rate,
int max_subdivisions)
{
Mesh basemesh;
create_mesh(scene, &basemesh, b_mesh, used_shaders);
SubdParams sdparams(mesh, used_shaders[0], true, false);
sdparams.dicing_rate = max(0.1f, RNA_float_get(cmesh, "dicing_rate") * dicing_rate);
sdparams.max_level = max_subdivisions;
scene->camera->update();
sdparams.camera = scene->camera;
@ -784,7 +786,8 @@ Mesh *BlenderSync::sync_mesh(BL::Object& b_ob,
if(b_mesh) {
if(render_layer.use_surfaces && !hide_tris) {
if(cmesh.data && experimental && RNA_enum_get(&cmesh, "subdivision_type"))
create_subd_mesh(scene, mesh, b_ob, b_mesh, &cmesh, used_shaders, dicing_rate);
create_subd_mesh(scene, mesh, b_ob, b_mesh, &cmesh, used_shaders,
dicing_rate, max_subdivisions);
else
create_mesh(scene, mesh, b_mesh, used_shaders);

16
intern/cycles/blender/blender_sync.cpp
View File

@ -64,10 +64,12 @@ BlenderSync::BlenderSync(BL::RenderEngine& b_engine,
experimental(false),
is_cpu(is_cpu),
dicing_rate(1.0f),
max_subdivisions(12),
progress(progress)
{
PointerRNA cscene = RNA_pointer_get(&b_scene.ptr, "cycles");
dicing_rate = preview ? RNA_float_get(&cscene, "preview_dicing_rate") : RNA_float_get(&cscene, "dicing_rate");
max_subdivisions = RNA_int_get(&cscene, "max_subdivisions");
}
BlenderSync::~BlenderSync()
@ -127,16 +129,24 @@ bool BlenderSync::sync_recalc()
}
}
bool dicing_rate_changed = false;
bool dicing_prop_changed = false;
if(experimental) {
PointerRNA cscene = RNA_pointer_get(&b_scene.ptr, "cycles");
float updated_dicing_rate = preview ? RNA_float_get(&cscene, "preview_dicing_rate")
: RNA_float_get(&cscene, "dicing_rate");
if(dicing_rate != updated_dicing_rate) {
dicing_rate = updated_dicing_rate;
dicing_rate_changed = true;
dicing_prop_changed = true;
}
int updated_max_subdivisions = RNA_int_get(&cscene, "max_subdivisions");
if(max_subdivisions != updated_max_subdivisions) {
max_subdivisions = updated_max_subdivisions;
dicing_prop_changed = true;
}
}
@ -146,7 +156,7 @@ bool BlenderSync::sync_recalc()
if(b_mesh->is_updated()) {
mesh_map.set_recalc(*b_mesh);
}
else if(dicing_rate_changed) {
else if(dicing_prop_changed) {
PointerRNA cmesh = RNA_pointer_get(&b_mesh->ptr, "cycles");
if(RNA_enum_get(&cmesh, "subdivision_type"))

1
intern/cycles/blender/blender_sync.h
View File

@ -173,6 +173,7 @@ private:
bool is_cpu;
float dicing_rate;
int max_subdivisions;
struct RenderLayerInfo {
RenderLayerInfo()

2
intern/cycles/subd/subd_dice.h
View File

@ -40,6 +40,7 @@ struct SubdParams {
int test_steps;
int split_threshold;
float dicing_rate;
int max_level;
Camera *camera;
Transform objecttoworld;
@ -53,6 +54,7 @@ struct SubdParams {
test_steps = 3;
split_threshold = 1;
dicing_rate = 0.1f;
max_level = 12;
camera = NULL;
}

67
intern/cycles/subd/subd_split.cpp
View File

@ -112,6 +112,59 @@ void DiagSplit::partition_edge(Patch *patch, float2 *P, int *t0, int *t1, float2
}
}
static float2 right_to_equilateral(float2 P)
{
static const float2 A = make_float2(1.0f, 0.5f);
static const float2 B = make_float2(0.0f, sinf(M_PI_F/3.0f));
return make_float2(dot(P, A), dot(P, B));
}
static void limit_edge_factors(const TriangleDice::SubPatch& sub, TriangleDice::EdgeFactors& ef, int max_t)
{
float2 Pu = sub.Pu;
float2 Pv = sub.Pv;
float2 Pw = sub.Pw;
if(sub.patch->is_triangle()) {
Pu = right_to_equilateral(Pu);
Pv = right_to_equilateral(Pv);
Pw = right_to_equilateral(Pw);
}
int tu = int(max_t * len(Pw - Pv));
int tv = int(max_t * len(Pw - Pu));
int tw = int(max_t * len(Pv - Pu));
ef.tu = tu <= 1 ? 1 : min(ef.tu, tu);
ef.tv = tv <= 1 ? 1 : min(ef.tv, tv);
ef.tw = tw <= 1 ? 1 : min(ef.tw, tw);
}
static void limit_edge_factors(const QuadDice::SubPatch& sub, QuadDice::EdgeFactors& ef, int max_t)
{
float2 P00 = sub.P00;
float2 P01 = sub.P01;
float2 P10 = sub.P10;
float2 P11 = sub.P11;
if(sub.patch->is_triangle()) {
P00 = right_to_equilateral(P00);
P01 = right_to_equilateral(P01);
P10 = right_to_equilateral(P10);
P11 = right_to_equilateral(P11);
}
int tu0 = int(max_t * len(P10 - P00));
int tu1 = int(max_t * len(P11 - P01));
int tv0 = int(max_t * len(P01 - P00));
int tv1 = int(max_t * len(P11 - P10));
ef.tu0 = tu0 <= 1 ? 1 : min(ef.tu0, tu0);
ef.tu1 = tu1 <= 1 ? 1 : min(ef.tu1, tu1);
ef.tv0 = tv0 <= 1 ? 1 : min(ef.tv0, tv0);
ef.tv1 = tv1 <= 1 ? 1 : min(ef.tv1, tv1);
}
void DiagSplit::split(TriangleDice::SubPatch& sub, TriangleDice::EdgeFactors& ef, int depth)
{
if(depth > 32) {
@ -172,6 +225,10 @@ void DiagSplit::split(TriangleDice::SubPatch& sub, TriangleDice::EdgeFactors& ef
QuadDice::SubPatch sub1 = {sub.patch, sub.Pw, Pv, Pu, Pcenter};
QuadDice::SubPatch sub2 = {sub.patch, sub.Pv, Pu, Pw, Pcenter};
limit_edge_factors(sub0, ef0, 1 << params.max_level);
limit_edge_factors(sub1, ef1, 1 << params.max_level);
limit_edge_factors(sub2, ef2, 1 << params.max_level);
split(sub0, ef0, depth+1);
split(sub1, ef1, depth+1);
split(sub2, ef2, depth+1);
@ -228,6 +285,9 @@ void DiagSplit::split(QuadDice::SubPatch& sub, QuadDice::EdgeFactors& ef, int de
QuadDice::SubPatch sub0 = {sub.patch, sub.P00, Pu0, sub.P01, Pu1};
QuadDice::SubPatch sub1 = {sub.patch, Pu0, sub.P10, Pu1, sub.P11};
limit_edge_factors(sub0, ef0, 1 << params.max_level);
limit_edge_factors(sub1, ef1, 1 << params.max_level);
split(sub0, ef0, depth+1);
split(sub1, ef1, depth+1);
}
@ -253,6 +313,9 @@ void DiagSplit::split(QuadDice::SubPatch& sub, QuadDice::EdgeFactors& ef, int de
QuadDice::SubPatch sub0 = {sub.patch, sub.P00, sub.P10, Pv0, Pv1};
QuadDice::SubPatch sub1 = {sub.patch, Pv0, Pv1, sub.P01, sub.P11};
limit_edge_factors(sub0, ef0, 1 << params.max_level);
limit_edge_factors(sub1, ef1, 1 << params.max_level);
split(sub0, ef0, depth+1);
split(sub1, ef1, depth+1);
}
@ -275,6 +338,8 @@ void DiagSplit::split_triangle(Patch *patch)
ef_split.tv = T(patch, sub_split.Pw, sub_split.Pu);
ef_split.tw = T(patch, sub_split.Pu, sub_split.Pv);
limit_edge_factors(sub_split, ef_split, 1 << params.max_level);
split(sub_split, ef_split);
TriangleDice dice(params);
@ -328,6 +393,8 @@ void DiagSplit::split_quad(Patch *patch)
ef_split.tv0 = T(patch, sub_split.P00, sub_split.P01);
ef_split.tv1 = T(patch, sub_split.P10, sub_split.P11);
limit_edge_factors(sub_split, ef_split, 1 << params.max_level);
split(sub_split, ef_split);
QuadDice dice(params);