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3D View: add Backface Culling option, to hide faces when seen from the back side,

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found in the Display panel.

Patch by Simon Kirk and Irie Shinsuke, refactored to also work for non-mesh objects
and avoid globals.
This commit is contained in:
Brecht Van Lommel 2012-05-25 09:26:47 +00:00
parent 29e89dc996
commit 19dd66cf3b
5 changed files with 45 additions and 1 deletions
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2
release/scripts/startup/bl_ui/space_view3d.py
View File

@ -2391,6 +2391,8 @@ class VIEW3D_PT_view3d_display(Panel):
col.prop(gs, "material_mode", text="")
col.prop(view, "show_textured_solid")
col.prop(view, "show_backface_culling")
layout.separator()
region = view.region_quadview

24
source/blender/editors/space_view3d/drawobject.c
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@ -3610,7 +3610,13 @@ static int draw_mesh_object(Scene *scene, ARegion *ar, View3D *v3d, RegionView3D
else if (ob->modifiers.first || obedit->modifiers.first) {}
else drawlinked = 1;
}
/* backface culling */
if (v3d->flag2 & V3D_BACKFACE_CULLING) {
glEnable(GL_CULL_FACE);
glCullFace(GL_BACK);
}
if (ob == obedit || drawlinked) {
DerivedMesh *finalDM, *cageDM;
@ -3669,6 +3675,9 @@ static int draw_mesh_object(Scene *scene, ARegion *ar, View3D *v3d, RegionView3D
}
}
}
if (v3d->flag2 & V3D_BACKFACE_CULLING)
glDisable(GL_CULL_FACE);
return retval;
}
@ -3939,7 +3948,17 @@ static int drawDispList(Scene *scene, View3D *v3d, RegionView3D *rv3d, Base *bas
const short solid = (dt > OB_WIRE);
int retval = 0;
/* backface culling */
if(v3d->flag2 & V3D_BACKFACE_CULLING) {
/* not all displists use same in/out normal direction convention */
glEnable(GL_CULL_FACE);
glCullFace((ob->type == OB_MBALL) ? GL_BACK : GL_FRONT);
}
if (drawCurveDerivedMesh(scene, v3d, rv3d, base, dt) == 0) {
if (v3d->flag2 & V3D_BACKFACE_CULLING)
glDisable(GL_CULL_FACE);
return 0;
}
@ -4045,6 +4064,9 @@ static int drawDispList(Scene *scene, View3D *v3d, RegionView3D *rv3d, Base *bas
break;
}
if (v3d->flag2 & V3D_BACKFACE_CULLING)
glDisable(GL_CULL_FACE);
return retval;
}

14
source/blender/gpu/intern/gpu_draw.c
View File

@ -1017,6 +1017,8 @@ static struct GPUMaterialState {
float (*gviewmat)[4];
float (*gviewinv)[4];
int backface_culling;
GPUBlendMode *alphablend;
GPUBlendMode alphablend_fixed[FIXEDMAT];
int use_alpha_pass, is_alpha_pass;
@ -1085,6 +1087,8 @@ void GPU_begin_object_materials(View3D *v3d, RegionView3D *rv3d, Scene *scene, O
GMS.lastretval = -1;
GMS.lastalphablend = GPU_BLEND_SOLID;
GMS.backface_culling = (v3d->flag2 & V3D_BACKFACE_CULLING);
GMS.gob = ob;
GMS.gscene = scene;
GMS.totmat= ob->totcol+1; /* materials start from 1, default material is 0 */
@ -1248,6 +1252,13 @@ int GPU_enable_material(int nr, void *attribs)
alphablend= mat->game.alpha_blend;
if (GMS.is_alpha_pass) glDepthMask(1);
if (GMS.backface_culling) {
if(mat->game.flag)
glEnable(GL_CULL_FACE);
else
glDisable(GL_CULL_FACE);
}
}
else {
/* or do fixed function opengl material */
@ -1283,6 +1294,9 @@ void GPU_disable_material(void)
GMS.lastretval= 1;
if (GMS.gboundmat) {
if (GMS.backface_culling)
glDisable(GL_CULL_FACE);
if (GMS.is_alpha_pass) glDepthMask(0);
GPU_material_unbind(GPU_material_from_blender(GMS.gscene, GMS.gboundmat));
GMS.gboundmat= NULL;

1
source/blender/makesdna/DNA_view3d_types.h
View File

@ -266,6 +266,7 @@ typedef struct View3D {
#define V3D_SHOW_RECONSTRUCTION 128
#define V3D_SHOW_CAMERAPATH 256
#define V3D_SHOW_BUNDLENAME 512
#define V3D_BACKFACE_CULLING 1024
/* View3D->around */
#define V3D_CENTER 0

5
source/blender/makesrna/intern/rna_space.c
View File

@ -1567,6 +1567,11 @@ static void rna_def_space_view3d(BlenderRNA *brna)
RNA_def_property_ui_text(prop, "Textured Solid", "Display face-assigned textures in solid view");
RNA_def_property_update(prop, NC_SPACE | ND_SPACE_VIEW3D, NULL);
prop = RNA_def_property(srna, "show_backface_culling", PROP_BOOLEAN, PROP_NONE);
RNA_def_property_boolean_sdna(prop, NULL, "flag2", V3D_BACKFACE_CULLING);
RNA_def_property_ui_text(prop, "Backface Culling", "Use back face culling to hide the back side of faces");
RNA_def_property_update(prop, NC_SPACE | ND_SPACE_VIEW3D, NULL);
prop = RNA_def_property(srna, "lock_camera", PROP_BOOLEAN, PROP_NONE);
RNA_def_property_boolean_sdna(prop, NULL, "flag2", V3D_LOCK_CAMERA);
RNA_def_property_ui_text(prop, "Lock Camera to View", "Enable view navigation within the camera view");