Use the old double-step collision method only for cloth.

This method does not work for hair anyway. Even though hair collision
needs work at this point, it's still better than nothing.

1 files changed, 25 insertions, 24 deletions

diff --git a/source/blender/physics/intern/BPH_mass_spring.cpp b/source/blender/physics/intern/BPH_mass_spring.cpp
index 483dfd08abd..1387f633c20 100644
--- a/source/blender/physics/intern/BPH_mass_spring.cpp
+++ b/source/blender/physics/intern/BPH_mass_spring.cpp
@@ -51,11 +51,6 @@ extern "C" {
 #include "BPH_mass_spring.h"

 #include "implicit.h"

 

-/* old collision stuff for cloth, use for continuity

- * until a good replacement is ready

- */

-#define USE_COLLISION_DOUBLE_SOLVE

-

 static float I3[3][3] = {{1.0, 0.0, 0.0}, {0.0, 1.0, 0.0}, {0.0, 0.0, 1.0}};

 

 /* Number of off-diagonal non-zero matrix blocks.

@@ -855,6 +850,9 @@ static void cloth_calc_volume_force(ClothModifierData *clmd)
 }

 #endif

 

+/* old collision stuff for cloth, use for continuity

+ * until a good replacement is ready

+ */

 static void cloth_collision_solve_extra(Object *ob, ClothModifierData *clmd, ListBase *effectors, float frame, float step, float dt)

 {

 	Cloth *cloth = clmd->clothObject;

@@ -977,6 +975,12 @@ static void cloth_record_result(ClothModifierData *clmd, ImplicitSolverResult *r
 

 int BPH_cloth_solve(Object *ob, float frame, ClothModifierData *clmd, ListBase *effectors)

 {

+	/* Hair currently is a cloth sim in disguise ...

+	 * Collision detection and volumetrics work differently then.

+	 * Bad design, TODO

+	 */

+	const bool is_hair = (clmd->hairdata != NULL);

+	

 	unsigned int i=0;

 	float step=0.0f, tf=clmd->sim_parms->timescale;

 	Cloth *cloth = clmd->clothObject;

@@ -984,10 +988,8 @@ int BPH_cloth_solve(Object *ob, float frame, ClothModifierData *clmd, ListBase *
 	unsigned int numverts = cloth->numverts;

 	float dt = clmd->sim_parms->timescale / clmd->sim_parms->stepsPerFrame;

 	Implicit_Data *id = cloth->implicit;

-#ifndef USE_COLLISION_DOUBLE_SOLVE

 	ColliderContacts *contacts = NULL;

 	int totcolliders = 0;

-#endif

 	

 	BKE_sim_debug_data_clear_category("collision");

 	

@@ -1016,20 +1018,19 @@ int BPH_cloth_solve(Object *ob, float frame, ClothModifierData *clmd, ListBase *
 			copy_v3_v3(verts[i].v, verts[i].tv);

 		}

 		

-#ifndef USE_COLLISION_DOUBLE_SOLVE

-		/* determine contact points */

-		if (clmd->coll_parms->flags & CLOTH_COLLSETTINGS_FLAG_ENABLED) {

-			if (clmd->coll_parms->flags & CLOTH_COLLSETTINGS_FLAG_POINTS) {

+		if (is_hair) {

+			/* determine contact points */

+			if (clmd->coll_parms->flags & CLOTH_COLLSETTINGS_FLAG_ENABLED) {

 				cloth_find_point_contacts(ob, clmd, 0.0f, tf, &contacts, &totcolliders);

 			}

+			

+			/* setup vertex constraints for pinned vertices and contacts */

+			cloth_setup_constraints(clmd, contacts, totcolliders, dt);

+		}

+		else {

+			/* setup vertex constraints for pinned vertices */

+			cloth_setup_constraints(clmd, NULL, 0, dt);

 		}

-		

-		/* setup vertex constraints for pinned vertices and contacts */

-		cloth_setup_constraints(clmd, contacts, totcolliders, dt);

-#else

-		/* setup vertex constraints for pinned vertices */

-		cloth_setup_constraints(clmd, NULL, 0, dt);

-#endif

 		

 		/* initialize forces to zero */

 		BPH_mass_spring_clear_forces(id);

@@ -1052,13 +1053,15 @@ int BPH_cloth_solve(Object *ob, float frame, ClothModifierData *clmd, ListBase *
 		BPH_mass_spring_solve_velocities(id, dt, &result);

 		cloth_record_result(clmd, &result, clmd->sim_parms->stepsPerFrame);

 		

-		cloth_continuum_step(clmd, dt);

+		if (is_hair) {

+			cloth_continuum_step(clmd, dt);

+		}

 		

 		BPH_mass_spring_solve_positions(id, dt);

 		

-#ifdef USE_COLLISION_DOUBLE_SOLVE

-		cloth_collision_solve_extra(ob, clmd, effectors, frame, step, dt);

-#endif

+		if (!is_hair) {

+			cloth_collision_solve_extra(ob, clmd, effectors, frame, step, dt);

+		}

 		

 		BPH_mass_spring_apply_result(id);

 		

@@ -1075,12 +1078,10 @@ int BPH_cloth_solve(Object *ob, float frame, ClothModifierData *clmd, ListBase *
 			BPH_mass_spring_get_motion_state(id, i, verts[i].txold, NULL);

 		}

 		

-#ifndef USE_COLLISION_DOUBLE_SOLVE

 		/* free contact points */

 		if (contacts) {

 			cloth_free_contacts(contacts, totcolliders);

 		}

-#endif

 		

 		step += dt;

 	}