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Warning! This version of documentation is OUTDATED, as it describes an older SDK version! Please switch to the documentation for the latest SDK version.
Warning! This version of documentation describes an old SDK version which is no longer supported! Please upgrade to the latest SDK version.

Unigine::DecalMesh Class

Header: #include <UnigineDecals.h>
Inherits: Decal

This class describes how to create and modify mesh decals.

Creating a Mesh Decal#

The following code illustrates how to create a mesh decal, set its parameters and add the node to UnigineEditor.

Source code (C++)
// AppWorldLogic.h

#include <UnigineLogic.h>
#include <UnigineObjects.h>
#include <UnigineEditor.h>
#include <UnigineDecals.h>

class AppWorldLogic : public Unigine::WorldLogic {
	
public:
	AppWorldLogic();
	virtual ~AppWorldLogic();
	
	virtual int init();
	
	virtual int update();
	virtual int render();
	virtual int flush();
	
	virtual int shutdown();
	virtual int destroy();
	
	virtual int save(const Unigine::StreamPtr &stream);
	virtual int restore(const Unigine::StreamPtr &stream);

private:
	Unigine::DecalMeshPtr decal_mesh;
};
Source code (C++)
// AppWorldLogic.cpp

#include "AppWorldLogic.h";

using namespace Unigine;

int AppWorldLogic::init()
{
	// create a mesh with a surface (e.g. a box primitive)
	MeshPtr mesh = Mesh::create();
	mesh->addBoxSurface("box_0", Math::vec3(1.0f));

	// create a mesh decal using created mesh and setting its radius to 10, material to "decal_base"
	decal_mesh = DecalMesh::create(mesh, 10.0f, "decal_base");

	// set the name and position of the decal
	decal_mesh->setName("Mesh Decal");
	decal_mesh->setWorldPosition(Math::Vec3(0.0f, 0.0f, 5.0f));

	// release ownership of its pointer and add the node to UnigineEditor
	decal_mesh->release();
	Editor::get()->addNode(decal_mesh->getNode());

	return 1;
}

int AppWorldLogic::shutdown() {
	
	// clear pointer
	decal_mesh.clear();

	return 1;
}

DecalMesh Class

Members


static DecalMeshPtr create ( const Ptr<Mesh> & mesh, float radius, const char * name )

Constructor. Creates a new mesh decal with the given properties.

Arguments

  • const Ptr<Mesh> & mesh - Pointer to Mesh.
  • float radius - The height of the decal projection box along the Z axis, in units.
  • const char * name - Material name.

static DecalMeshPtr create ( const char * mesh_name, float radius, const char * name )

Constructor. Creates a new mesh decal with the given properties.

Arguments

  • const char * mesh_name - Mesh name.
    Notice
    The mesh should contain a single surface. In case if the mesh contains several surfaces, only the one with the 0 index will be used. Thus, the area of the decal will differ from the initial mesh.
  • float radius - The height of the decal projection box along the Z axis, in units.
  • const char * name - Material name

Ptr<DecalMesh> cast( const Ptr<Node> & node )

Casts a mesh decal out of the Node instance.

Arguments

  • const Ptr<Node> & node - Node smart pointer.

Return value

Pointer to the DecalMesh.

Ptr<DecalMesh> cast( const Ptr<Decal> & base )

Casts a DecalMesh out of the Decal instance.

Arguments

  • const Ptr<Decal> & base - Decal smart pointer.

Return value

Pointer to the DecalMesh.

int setMesh( const Ptr<Mesh> & mesh, int unique = 1 )

Copies a given source mesh into the current decal mesh.
Source code (C++)
// create an empty decal mesh
DecalMeshPtr decalMesh = DecalMesh::create(NULL,8.0f,"decal_base_0");
// create a mesh
MeshPtr mesh = Mesh::create("decal.mesh");
// copy the mesh into the decal mesh
decalMesh->setMesh(mesh);

Arguments

  • const Ptr<Mesh> & mesh - Mesh to be set.
    Notice
    The mesh should contain a single surface. In case if the mesh contains several surfaces, only the one with the 0 index will be used. Thus, the area of the decal will differ from the initial mesh.
  • int unique - Unique flag used when you create several objects out of a single Mesh instance:
    • 0 - An instance of source mesh geometry is created. If the source geometry is changed at runtime, its instances will be changed as well.
    • 1 - A copy of source mesh geometry is created and changes made to the source geometry do not affect the mesh.

Return value

1 if the mesh is copied successfully; otherwise, 0.

int getMesh( const Ptr<Mesh> & mesh )

Copies the current decal mesh into the received mesh. For example, you can obtain geometry of the decal mesh and then change it:
Source code (C++)
// a decal mesh from which geometry will be obtained
DecalMeshPtr decalMesh = DecalMesh::create("decal.mesh",8.0f,"decal_base_0");
// create a new mesh
MeshPtr mesh = Mesh::create();
// copy geometry to the created mesh
if (decalMesh->getMesh(mesh)) {
	// do something with the obtained mesh
}
else {
	Log::error("Failed to copy a mesh\n");
}

Arguments

  • const Ptr<Mesh> & mesh - Current mesh.

Return value

1 if the mesh is copied successfully; otherwise, 0.

void setMeshName( const char * name, int force_load = 0 )

Sets a new name for the mesh and forces loading of the mesh with the new name for the current decal mesh.
Notice
The mesh should contain a single surface. In case if the mesh contains several surfaces, only the one with the 0 index will be used. Thus, the area of the decal will differ from the initial mesh.

Arguments

  • const char * name - A new name to be set for the mesh.
  • int force_load - Force flag.
    • If 1 is specified, the mesh with the new name will be loaded immediately with the unique flag set to 0.
    • If 0 is specified, only the mesh name will be updated.

const char * getMeshName( )

Returns the name of the mesh used as a base for the decal.

Return value

The mesh name.

void setRadius( float radius )

Sets the new height of the decal projection box along the Z axis.

Arguments

  • float radius - The height of the decal projection box along the Z axis, in units.

float getRadius( )

Returns the current height of the decal projection box along the Z axis.

Return value

The height of the decal projection box along the Z axis, in units.

void loadMesh( const char * name, int unique = 0 )

Loads a mesh for the current mesh from the file. This function doesn't change the mesh name.

Arguments

  • const char * name - The name of the mesh file.
    Notice
    The mesh should contain a single surface. In case if the mesh contains several surfaces, only the one with the 0 index will be used. Thus, the area of the decal will differ from the initial mesh.
  • int unique - Unique flag used when you create several objects out of a single .mesh file:
    • 0 - An instance of source mesh geometry is created. If the source geometry is changed at runtime, its instances will be changed as well.
    • 1 - A copy of source mesh geometry is created and changes made to the source geometry do not affect the mesh.

int saveMesh( const char * name )

Saves the decal mesh into a file.

Arguments

  • const char * name - A name of the mesh file.

Return value

1 if the mesh is saved successfully; otherwise, 0.

int type( )

Returns a DecalMesh type identifier.

Return value

Type identifier.
Last update: 2018-12-27
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