Welcome to mirror list, hosted at ThFree Co, Russian Federation.

git.blender.org/blender.git - Unnamed repository; edit this file 'description' to name the repository.
summaryrefslogtreecommitdiff
path: root/intern/cycles/kernel/kernel_bvh.h
diff options
context:
space:
mode:
Diffstat (limited to 'intern/cycles/kernel/kernel_bvh.h')
-rw-r--r--intern/cycles/kernel/kernel_bvh.h267
1 files changed, 261 insertions, 6 deletions
diff --git a/intern/cycles/kernel/kernel_bvh.h b/intern/cycles/kernel/kernel_bvh.h
index 73e7fb0e5d6..15af35a05f8 100644
--- a/intern/cycles/kernel/kernel_bvh.h
+++ b/intern/cycles/kernel/kernel_bvh.h
@@ -205,6 +205,151 @@ __device_inline void bvh_triangle_intersect(KernelGlobals *kg, Intersection *ise
}
}
+#ifdef __HAIR__
+__device_inline void bvh_curve_intersect(KernelGlobals *kg, Intersection *isect,
+ float3 P, float3 idir, uint visibility, int object, int triAddr)
+{
+ /* curve Intersection check */
+
+ int flags = kernel_data.curve_kernel_data.curveflags;
+
+ int prim = kernel_tex_fetch(__prim_index, triAddr);
+ float4 v00 = kernel_tex_fetch(__cur_segs, prim);
+
+ int v1 = __float_as_int(v00.x);
+ int v2 = __float_as_int(v00.y);
+
+ float4 P1 = kernel_tex_fetch(__cur_keys, v1);
+ float4 P2 = kernel_tex_fetch(__cur_keys, v2);
+
+ float l = v00.w;
+ float r1 = P1.w;
+ float r2 = P2.w;
+ float mr = max(r1,r2);
+ float3 p1 = float4_to_float3(P1);
+ float3 p2 = float4_to_float3(P2);
+ float3 dif = P - p1;
+ float3 dir = 1.0f/idir;
+
+ /* test bounding sphere intersection (introduce circular artifacts)*/
+ /*float3 bvector = 0.5f * (p1 + p2) - P;
+ float bvectorl_sq = len_squared(bvector);
+ float dot_bv_dir = dot(bvector,dir);
+ float maxdist = l * 0.5f + mr;
+ if(bvectorl_sq - dot_bv_dir * dot_bv_dir > maxdist * maxdist)
+ return;*/
+
+ /* obtain parameters and test midpoint distance for suitable modes*/
+ float3 tg = (p2 - p1) / l;
+ float gd = (r2 - r1) / l;
+ float dirz = dot(dir,tg);
+ float difz = dot(dif,tg);
+
+ float a = 1.0f - (dirz*dirz*(1 + gd*gd));
+ float halfb = (dot(dir,dif) - dirz*(difz + gd*(difz*gd + r1)));
+
+ float tcentre = -halfb/a;
+ float zcentre = difz + (dirz * tcentre);
+
+ if((tcentre > isect->t) && !(flags & CURVE_KN_ACCURATE))
+ return;
+ if((zcentre < 0 || zcentre > l) && !(flags & CURVE_KN_ACCURATE) && !(flags & CURVE_KN_INTERSECTCORRECTION))
+ return;
+
+ /* test minimum separation*/
+ float3 cprod = cross(tg, dir);
+ float3 cprod2 = cross(tg, dif);
+ float cprodsq = len_squared(cprod);
+ float cprod2sq = len_squared(cprod2);
+ float distscaled = dot(cprod,dif);
+
+ if(cprodsq == 0)
+ distscaled = cprod2sq;
+ else
+ distscaled = (distscaled*distscaled)/cprodsq;
+
+ if(distscaled > mr*mr)
+ return;
+
+ /* calculate true intersection*/
+ float3 tdif = P - p1 + tcentre * dir;
+ float tdifz = dot(tdif,tg);
+ float tb = 2*(dot(dir,tdif) - dirz*(tdifz + gd*(tdifz*gd + r1)));
+ float tc = dot(tdif,tdif) - tdifz * tdifz * (1 + gd*gd) - r1*r1 - 2*r1*tdifz*gd;
+ float td = tb*tb - 4*a*tc;
+
+ if (td<0)
+ return;
+
+ float rootd = 0.0f;
+ float correction = 0.0f;
+ if(flags & CURVE_KN_ACCURATE) {
+ rootd = sqrtf(td);
+ correction = ((-tb - rootd)/(2*a));
+ }
+
+ float t = tcentre + correction;
+
+ if(t < isect->t) {
+
+ if(flags & CURVE_KN_INTERSECTCORRECTION) {
+ rootd = sqrtf(td);
+ correction = ((-tb - rootd)/(2*a));
+ t = tcentre + correction;
+ }
+
+ float z = zcentre + (dirz * correction);
+ bool backface = false;
+
+ if(flags & CURVE_KN_BACKFACING && (t < 0.0f || z < 0 || z > l)) {
+ backface = true;
+ correction = ((-tb + rootd)/(2*a));
+ t = tcentre + correction;
+ z = zcentre + (dirz * correction);
+ }
+
+ if(t > 0.0f && t < isect->t && z >= 0 && z <= l) {
+
+ if (flags & CURVE_KN_ENCLOSEFILTER) {
+
+ float enc_ratio = kernel_data.curve_kernel_data.encasing_ratio;
+ if((dot(P - p1, tg) > -r1 * enc_ratio) && (dot(P - p2, tg) < r2 * enc_ratio)) {
+ float a2 = 1.0f - (dirz*dirz*(1 + gd*gd*enc_ratio*enc_ratio));
+ float c2 = dot(dif,dif) - difz * difz * (1 + gd*gd*enc_ratio*enc_ratio) - r1*r1*enc_ratio*enc_ratio - 2*r1*difz*gd*enc_ratio;
+ if(a2*c2 < 0.0f)
+ return;
+ }
+ }
+
+ /*remove overlap - not functional yet*/
+ /*if (flags & CURVE_KN_CURVEDATA) {
+ float3 tg1 = float4_to_float3(kernel_tex_fetch(__tri_woop, triAddr*TRI_NODE_SIZE+0));
+ float3 tg2 = float4_to_float3(kernel_tex_fetch(__tri_woop, triAddr*TRI_NODE_SIZE+1));
+ if((dot(P + t * dir - p1, tg1) < 0.0f) || (dot(P + t * dir - p2, tg2) > 0.0f))
+ return;
+ }*/
+
+ #ifdef __VISIBILITY_FLAG__
+ /* visibility flag test. we do it here under the assumption
+ * that most triangles are culled by node flags */
+ if(kernel_tex_fetch(__prim_visibility, triAddr) & visibility)
+ #endif
+ {
+ /* record intersection */
+ isect->prim = triAddr;
+ isect->object = object;
+ isect->u = z/l;
+ isect->v = td/(4*a*a);
+ isect->t = t;
+
+ if(backface)
+ isect->u = -isect->u;
+ }
+ }
+ }
+}
+#endif
+
__device_inline bool bvh_intersect(KernelGlobals *kg, const Ray *ray, const uint visibility, Intersection *isect)
{
/* traversal stack in CUDA thread-local memory */
@@ -281,10 +426,15 @@ __device_inline bool bvh_intersect(KernelGlobals *kg, const Ray *ray, const uint
nodeAddr = traversalStack[stackPtr];
--stackPtr;
- /* triangle intersection */
+ /* primitive intersection */
while(primAddr < primAddr2) {
- /* intersect ray against triangle */
- bvh_triangle_intersect(kg, isect, P, idir, visibility, object, primAddr);
+ /* intersect ray against primitive */
+#ifdef __HAIR__
+ if(kernel_tex_fetch(__prim_type, primAddr))
+ bvh_curve_intersect(kg, isect, P, idir, visibility, object, primAddr);
+ else
+#endif
+ bvh_triangle_intersect(kg, isect, P, idir, visibility, object, primAddr);
/* shadow ray early termination */
if(visibility == PATH_RAY_SHADOW_OPAQUE && isect->prim != ~0)
@@ -401,10 +551,15 @@ __device_inline bool bvh_intersect_motion(KernelGlobals *kg, const Ray *ray, con
nodeAddr = traversalStack[stackPtr];
--stackPtr;
- /* triangle intersection */
+ /* primitive intersection */
while(primAddr < primAddr2) {
- /* intersect ray against triangle */
- bvh_triangle_intersect(kg, isect, P, idir, visibility, object, primAddr);
+ /* intersect ray against primitive */
+#ifdef __HAIR__
+ if(kernel_tex_fetch(__prim_type, primAddr))
+ bvh_curve_intersect(kg, isect, P, idir, visibility, object, primAddr);
+ else
+#endif
+ bvh_triangle_intersect(kg, isect, P, idir, visibility, object, primAddr);
/* shadow ray early termination */
if(visibility == PATH_RAY_SHADOW_OPAQUE && isect->prim != ~0)
@@ -545,5 +700,105 @@ __device_inline float3 bvh_triangle_refine(KernelGlobals *kg, ShaderData *sd, co
#endif
}
+#ifdef __HAIR__
+__device_inline float3 bvh_curve_refine(KernelGlobals *kg, ShaderData *sd, const Intersection *isect, const Ray *ray, float t)
+{
+ int flag = kernel_data.curve_kernel_data.curveflags;
+ float3 P = ray->P;
+ float3 D = ray->D;
+
+ if(isect->object != ~0) {
+#ifdef __OBJECT_MOTION__
+ Transform tfm = sd->ob_itfm;
+#else
+ Transform tfm = object_fetch_transform(kg, isect->object, OBJECT_INVERSE_TRANSFORM);
+#endif
+
+ P = transform_point(&tfm, P);
+ D = transform_direction(&tfm, D*t);
+ D = normalize_len(D, &t);
+ }
+
+ int prim = kernel_tex_fetch(__prim_index, isect->prim);
+ float4 v00 = kernel_tex_fetch(__cur_segs, prim);
+
+ int v1 = __float_as_int(v00.x);
+ int v2 = __float_as_int(v00.y);
+
+ float4 P1 = kernel_tex_fetch(__cur_keys, v1);
+ float4 P2 = kernel_tex_fetch(__cur_keys, v2);
+ float l = v00.w;
+ float r1 = P1.w;
+ float r2 = P2.w;
+ float3 tg = float4_to_float3(P2 - P1) / l;
+ float3 dif = P - float4_to_float3(P1) + t * D;
+ float gd = ((r2 - r1)/l);
+
+ P = P + D*t;
+
+ dif = P - float4_to_float3(P1);
+
+ #ifdef __UV__
+ sd->u = dot(dif,tg)/l;
+ sd->v = 0.0f;
+ #endif
+
+ if (flag & CURVE_KN_TRUETANGENTGNORMAL) {
+ sd->Ng = -(D - tg * (dot(tg,D) * kernel_data.curve_kernel_data.normalmix));
+ sd->Ng = normalize(sd->Ng);
+ if (flag & CURVE_KN_NORMALCORRECTION)
+ {
+ //sd->Ng = normalize(sd->Ng);
+ sd->Ng = sd->Ng - gd * tg;
+ sd->Ng = normalize(sd->Ng);
+ }
+ }
+ else {
+ sd->Ng = (dif - tg * sd->u * l) / (P1.w + sd->u * l * gd);
+ if (gd != 0.0f) {
+ sd->Ng = sd->Ng - gd * tg ;
+ sd->Ng = normalize(sd->Ng);
+ }
+ }
+
+ sd->N = sd->Ng;
+
+ if (flag & CURVE_KN_TANGENTGNORMAL && !(flag & CURVE_KN_TRUETANGENTGNORMAL)) {
+ sd->N = -(D - tg * (dot(tg,D) * kernel_data.curve_kernel_data.normalmix));
+ sd->N = normalize(sd->N);
+ if (flag & CURVE_KN_NORMALCORRECTION) {
+ //sd->N = normalize(sd->N);
+ sd->N = sd->N - gd * tg;
+ sd->N = normalize(sd->N);
+ }
+ }
+ if (!(flag & CURVE_KN_TANGENTGNORMAL) && flag & CURVE_KN_TRUETANGENTGNORMAL) {
+ sd->N = (dif - tg * sd->u * l) / (P1.w + sd->u * l * gd);
+ if (gd != 0.0f) {
+ sd->N = sd->N - gd * tg ;
+ sd->N = normalize(sd->N);
+ }
+ }
+
+ #ifdef __DPDU__
+ /* dPdu/dPdv */
+ sd->dPdu = tg;
+ sd->dPdv = cross(tg,sd->Ng);
+ #endif
+
+ if(isect->object != ~0) {
+#ifdef __OBJECT_MOTION__
+ Transform tfm = sd->ob_tfm;
+#else
+ Transform tfm = object_fetch_transform(kg, isect->object, OBJECT_TRANSFORM);
+#endif
+
+ P = transform_point(&tfm, P);
+ }
+
+ return P;
+}
+#endif
+
CCL_NAMESPACE_END
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-09 21:54:50 +0300