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Cycles OSL: support for the trace(point pos, vector dir, ...) function, to trace

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rays from the OSL shader. The "shade" parameter is not supported currently, but
attributes can be retrieved from the object that was hit using the
getmessage("trace", ..) function.

As mentioned in the OSL specification, this function can't be used instead of
lighting, the main purpose is to allow shaders to "probe" nearby geometry, for
example to apply a projected texture that can be blocked by geometry, apply
more “wear” to exposed geometry, or make other ambient occlusion-like effects.

http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes/OSL#Trace

Example .blend and render:
http://www.pasteall.org/blend/17347
http://www.pasteall.org/pic/show.php?id=40066
This commit is contained in:
Brecht Van Lommel
2012-11-06 19:59:10 +00:00
parent 209cd25745
commit 3e9f2938f0
5 changed files with 240 additions and 87 deletions
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17
intern/cycles/kernel/osl/osl_shader.cpp
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@@ -93,6 +93,7 @@ static void shaderdata_to_shaderglobals(KernelGlobals *kg, ShaderData *sd,
/* shader data to be used in services callbacks */
globals->renderstate = sd;
globals->tracedata = NULL;
/* hacky, we leave it to services to fetch actual object matrix */
globals->shader2common = sd;
@@ -219,6 +220,10 @@ void OSLShader::eval_surface(KernelGlobals *kg, ShaderData *sd, float randb, int
if (kg->osl.surface_state[shader])
ss->execute(*ctx, *(kg->osl.surface_state[shader]), *globals);
/* free trace data */
if(globals->tracedata)
delete (OSLRenderServices::TraceData*)globals->tracedata;
/* flatten closure tree */
sd->num_closure = 0;
sd->randb_closure = randb;
@@ -274,6 +279,10 @@ float3 OSLShader::eval_background(KernelGlobals *kg, ShaderData *sd, int path_fl
if (kg->osl.background_state)
ss->execute(*ctx, *(kg->osl.background_state), *globals);
/* free trace data */
if(globals->tracedata)
delete (OSLRenderServices::TraceData*)globals->tracedata;
/* return background color immediately */
if (globals->Ci)
return flatten_background_closure_tree(globals->Ci);
@@ -352,6 +361,10 @@ void OSLShader::eval_volume(KernelGlobals *kg, ShaderData *sd, float randb, int
if (kg->osl.volume_state[shader])
ss->execute(*ctx, *(kg->osl.volume_state[shader]), *globals);
/* free trace data */
if(globals->tracedata)
delete (OSLRenderServices::TraceData*)globals->tracedata;
if (globals->Ci)
flatten_volume_closure_tree(sd, globals->Ci);
}
@@ -375,6 +388,10 @@ void OSLShader::eval_displacement(KernelGlobals *kg, ShaderData *sd)
if (kg->osl.displacement_state[shader])
ss->execute(*ctx, *(kg->osl.displacement_state[shader]), *globals);
/* free trace data */
if(globals->tracedata)
delete (OSLRenderServices::TraceData*)globals->tracedata;
/* get back position */
sd->P = TO_FLOAT3(globals->P);
}